Dictionary of Engineering Episode 2 Part 1 ppsx

{ga¯⭈bəlbo˙rd } is produced by an amplifier; usually given as Gabor trolley [ENG]A small three-wheel trolley the ratio of output to input voltage, current, orwith knife-edge wheels, used

functional analysis diagram

system, software, or organization must perform that sometimes holds a filter; the function is to

to achieve its desired outputs, that is, the trans- direct flow of a liquid or, if a filter is present, toformations necessary to turn available inputs direct a flow that was filtered {fən⭈əl }into the desired outputs {¦fəŋk⭈shən⭈əl ənal⭈ funnel-flow bin [ENG]A bin in which solid flows

functional analysis diagram [SYS ENG]A repre- stagnant material {fən⭈əl ¦flo¯ bin }sentation of functional analysis and, in particu- furfural extraction [CHEM ENG] Process for thelar, the transformations necessary to turn avail- refining of lubricating oils and other organicable inputs into the desired outputs, the flow of materials by contact with furfural {fər⭈fəraldata or items between functions, the processing ikstrak⭈shən }

instructions that are available to guide the trans- furlong [MECH]A unit of length, equal to 1/8formation, and the control logic that dictates the mile, 660 feet, or 201.168 meters. {fərlo˙ŋ }activation and termination of functions {¦fəŋk⭈ furnace [ENG] An apparatus in which heat isshən⭈əl ənal⭈ə⭈səs dı¯⭈əgram } liberated and transferred directly or indirectly to

functional decomposition [CONT SYS]The par- a solid or fluid mass for the purpose of effectingtitioning of a large-scale control system into a a physical or chemical change. {fər⭈nəs }nested set of generic control functions, namely furnace lining [ENG] The interior part of a fur-the regulatory or direct control function, the opti- nace in contact with a molten charge and hotmizing control function, the adaptive control gases; constructed of heat-resistant material.function, and the self-organizing function {fər⭈nəs lı¯n⭈iŋ }

{fəŋk⭈shən⭈əl de¯ka¨m⭈pəzish⭈ən } furnish [CHEM ENG] In papermaking, the raw

functional design [SYS ENG] The aspect of sys- materials placed in a beater for producing papertem design concerned with the system’s objec- pulp. {fər⭈nish }

tives and functions, rather than its specific com- furred ceiling [BUILD] A ceiling in which the ponents {fəŋk⭈shən⭈əl dizı¯n } ring units are attached directly to the structural

fur-functional forms analysis chartchart. {fəŋk⭈shən⭈əl fo¯rmz ənal⭈ə⭈səs cha¨rt }See form process units of the building. {¦fərd se¯⭈liŋ }

furring [BUILD]Thin strips of wood or metal

fas-function failure safety [ENG]The capability of tened to joists, studs, ceilings, or inner walls of

an electronic-mass measuring instrument to a building to provide a level surface or air spacewithhold the release of an incorrect measure-

over which the finished surface can be applied.ment when there is a function failure {fəŋk⭈

Also known as batten; furring strip {fər⭈iŋ }shən ¦fa¯lyər sa¯f⭈te¯ }

furring stripSee furring. {fər⭈iŋ strip }

fundamental interval [THERMO]1.The value

ar-furrow [ENG]A trench plowed in the ground.bitrarily assigned to the difference in tempera-

{fər⭈o¯ }ture between two fixed points (such as the ice

fuse [ELEC]An expendable device for openingpoint and steam point) on a temperature scale,

an electric circuit when the current therein

be-in order to defbe-ine the scale 2.The difference

comes excessive, containing a section of between the values recorded by a thermometer

conduc-tor which melts when the current through it

ex-at two fixed points; for example, the difference

ceeds a rated value for a definite period of time.between the resistances recorded by a resistance

Also known as electric fuse [ENG] Alsothermometer at the ice point and steam point

spelled fuze 1.A device with explosive {¦fən⭈də¦men⭈təl int⭈ər⭈vəl }

compo-nents designed to initiate a train of fire or

deto-fundamental motion See elemental motion

nation in an item of ammunition by an action{¦fən⭈də¦ment⭈əl mo¯⭈shən }

such as hydrostatic pressure, electrical energy,

fungible [CHEM ENG] Pertaining to petroleum

chemical energy, impact, or a combination ofproducts whose characteristics are so similar

these 2.A nonexplosive device designed tothey can be commingled {fən⭈jə⭈bəl }

initiate an explosion in an item of ammunition

fungi-proofing [ENG]Application of a

protec-by an action such as continuous or pulsatingtive chemical coating that inhibits growth of

electromagnetic waves or acceleration { fyu¨z }fungi {fənjı¯ pru˙f⭈iŋ }

fuse blasting cap [ENG]A small copper cylinder

funicularSee funicular railroad. { fənik⭈yə⭈lər }

closed at one end and charged with a fulminate

funicular polygon [MECH] 1.The figure formed

{¦fyu¨z blast⭈iŋ kap }

by a light string hung between two points from

fuse body [ENG] The part of a fuse contributingwhich weights are suspended at various points

the major portion of the total weight, and which

2.A force diagram for such a string, in which the

houses the majority of the functioning parts, andforces (weights and tensions) acting on points

to which smaller parts are attached {fyu¨z

of the string from which weights are suspended

ba¨d⭈e¯ }are represented by a series of adjacent triangles

fuse diode [ELECTR]A diode that opens under{ fənik⭈yə⭈lər pa¨l⭈əga¨n }

specified current surge conditions {fyu¨z

funicular railroad [ENG]A railroad system used

dı¯o¯d }primarily to ascend and descend mountains; the

fused junctionSee alloy junction. {¦fu¨zd jəŋk⭈weight of the descending train helps to move

shən }the ascending train up the mountain Also

fused-junction diode See alloy-junction diode.

known as funicular { fənik⭈yə⭈lər ra¯lro¯d }

funnel [DES ENG] A tube with one conical end {¦fyu¨zd ¦jəŋk⭈shən dı¯o¯d }

fuzzy system

fused-junction transistorSee alloy-junction tran- fusion piercing [ENG] A method of producing

vertical blastholes by virtually burning holes insistor {¦fyu¨zd ¦jəŋk⭈shən tranzis⭈tər }

fused semiconductor [ELECTR] Junction rock Also known as piercing {fyu¨⭈zhən

pir⭈siŋ }formed by recrystallization on a base crystal from

a liquid phase of one or more components and fusion-piercing drill [ENG] A machine designed

to use the fusion-piercing mode of producingthe semiconductor {¦fyu¨zd sem⭈i⭈kən dək⭈

jet-pierc-ing drill; Linde drill {fyu¨⭈zhən pirs⭈iŋ dril }

fuse gage [ENG]An instrument for slicing time

fuses to length {fyu¨z ga¯j } fuzzy controller [CONT SYS] An automatic

con-troller in which the relation between the state

fusehead [ENG] That part of an electric

detona-tor consisting of twin metal conducdetona-tors, bridged variables of the process under control and the

action variables, whose values are computed

by fine resistance wire, and surrounded by a bead

of igniting compound which burns when the fir- from observations of the state variables, is given

as a set of fuzzy implications or as a fuzzy ing current is passed through the bridge wire

fuzzy system [SYS ENG] A process that is too

fuse lighter [ENG] A device for facilitating the

ignition of the powder core of a fuse {fyu¨z complex to be modeled by using conventional

mathematical methods, and that gives rise to

lı¯d⭈ər }

fusibility [THERMO] The quality or degree of be- data that are, in general, soft, with no precise

boundaries; examples are large-scale ing capable of being liquefied by heat {fyu¨⭈

eco-nomic systems, management systems, medical

fusible plugSee safety plug. {¦fyu¨⭈zə⭈bəl pləg }

fusing disk [MECH ENG]A rapidly spinning disk diagnostic processes, and human perception

{¦fəz⭈e¯ sis⭈təm }that cuts metal by melting it {fyu¨z⭈iŋ disk }

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a part in a jig, fixture, or qualifying gage

gSee gram.

{ga¯j po˙int }

G [ELEC] See conductance. [MECH]A unit of

gage pressure [MECH ENG]The amount byacceleration equal to the standard acceleration

which the total absolute pressure exceeds the

of gravity, 9.80665 meters per second per second,

ambient atmospheric pressure {ga¯j presh⭈

or approximately 32.1740 feet per second per

ər }second Also known as fors; grav

gaging hatch [ENG] An opening in a tank or

GaAs FETSee gallium arsenide field-effect

transis-other vessel through which measuring and tor {gasfet }

sam-pling can be performed {ga¯j⭈iŋ hach }

gabion [ENG]A bottomless basket of

wicker-gaging tape [ENG]A metal measuring tapework or metal iron filled with earth or stones;

used to determine the depth of liquid in a tank.used in building fieldworks or as revetments in

{ga¯j⭈iŋ ta¯p }mining Also known as pannier {ga¯⭈be¯⭈ən }

gain [ELECTR] The increase in signal power that

gableboardSee vergeboard. {ga¯⭈bəlbo˙rd }

is produced by an amplifier; usually given as

Gabor trolley [ENG]A small three-wheel trolley

the ratio of output to input voltage, current, orwith knife-edge wheels, used in constructing tra-

power, expressed in decibels Also known asjectories of charged particles in an electric field

transmission gain [ENG]A cavity in a piece{ga¨bo˙r tra¨⭈le¯ }

of wood prepared by notching or mortising so

gage Also spelled gauge [CIV ENG] The

dis-that a hinge or other hardware or another piecetance between the inner faces of the rails of

of wood can be placed on the cavity { ga¯n }railway track; standard gage in the United States

gain asymptotes [CONT SYS] Asymptotes to a

is 4 feet 81/2 inches (1.44 meters) [DES

logarithmic graph of gain as a function of ENG]1.A device for determining the relative

fre-quency {ga¯n as⭈əmto¯ts }shape or size of an object 2.The thickness

gain-crossover frequency [CONT SYS]The

fre-of a metal sheet, a rod, or a wire [ENG] The

quency at which the magnitude of the loop ratiominimum sieve size through which most (95% is unity. {¦ga¯n ¦kro˙so¯⭈vər fre¯⭈kwən⭈se¯ }

or more) of an aggregate will pass { ga¯j } gain margin [CONT SYS] The reciprocal of the

gage block [DES ENG]A chrome steel block magnitude of the loop ratio at the phase having two flat, parallel surfaces with the parallel over frequency, frequently expressed in decibels.distance between them being the size marked {ga¯n ma¨r⭈jən }

cross-on the block to a guaranteed accuracy of a few gain scheduling [CONT SYS] A method of millionths of an inch; used as the standard of nating influences of variations in the processprecise lineal measurement for most manufac- dynamics of a control system by changing theturing processes Also known as precision parameters of the regulator as functions of auxil-block; size block {ga¯j bla¨k } iary variables which correlate well with those

elimi-gage cock [ENG] A valve located on a water dynamics. {ga¯n skej⭈ə⭈liŋ }

column of a boiler drum {ga¯j ka¨k } gal [MECH] 1.The unit of acceleration in the

gage glass [ENG] A glass, plastic, or metal centimeter-gram-second system, equal to 1 tube, usually equipped with shutoff valves, that timeter per second squared; commonly used in

cen-is connected by a suitable fitting to a tank or geodetic measurement Formerly known as vessel, for the measurement of liquid level leo Symbolized Gal 2. See gallon. { gal }

gage length [ENG]Original length of the por- Galilean transformation [MECH]A tion of a specimen measured for strain, length cal transformation used to relate the space andchanges, and other characteristics {ga¯j time variables of two uniformly moving (inertial)

gage plate [CIV ENG] A plate inserted between {gal⭈ə¦le¯⭈ən tranz⭈fərma¯⭈shən }

the parallel rails of a railroad track to maintain galileoSee gal. {gal⭈əle¯⭈o¯ }

the gage {ga¯j pla¯t } Galileo’s law of inertiaSee Newton’s first law.

{gal⭈əle¯⭈o¯z ¦lo˙ əv inər⭈shə }

gage point [DES ENG]A point used to position

Galitzin pendulum

Galitzin pendulum [MECH] A massive horizon- gamma camera [ENG] An instrument

con-sisting of a large, thin scintillation crystal or arraytal pendulum that is used to measure variations

in the direction of the force of gravity with time, of photomultiplier tubes, a multichannel

colli-mator, and circuitry to analyze the pulses and thus serves as the basis of a seismograph

pro-{ ga¨¦lit⭈sən pen⭈jə⭈ləm } duced by the photomultipliers; used to visualize

the distribution of radioactive compounds in the

galley [ENG] The kitchen of a ship, airplane, or

gamma counter [ENG] A device for detecting

gallium arsenide field-effect transistor[ELECTR]

A field-effect transistor in which current between gamma radiation, primarily through the

detec-tion of fast electrons produced by the gammathe ohmic source and drain contacts is carried

by free electrons in a channel consisting of n- rays; it either yields information about integrated

intensity within a time interval or detects eachtype gallium arsenide, and this current is modu-

lated by a Schottky-barrier rectifying contact photon separately {gam⭈ə kau˙nt⭈ər }

gamma logging [ENG] Obtaining, by means ofcalled the gate that varies the cross-sectional

area of the channel Abbreviated GaAs FET a gamma-ray probe, a record of the intensities

of gamma rays emitted by the rock strata {gal⭈e¯⭈əm a¨rs⭈ənı¯d fe¯ld i¦fekt tranzis⭈tər }

pene-gallon [MECH] Abbreviated gal 1.A unit of trated by a borehole {gam⭈ə la¨g⭈iŋ }

gamma-ray altimeter [ENG]An altimeter, usedvolume used in the United States for measure-

ment of liquid substances, equal to 231 cubic at altitudes under several hundred feet, that

measures the photon backscatter from the earthinches, or to 3.785 411 784⫻ 10⫺3cubic meter,

or to 3.785 411 784 liters; equal to 128 fluid resulting from the transmission of photons to

earth from a cobalt-60 gamma source in theounces 2.A unit of volume used in the United

Kingdom for measurement of liquid and solid plane {gam⭈ə ra¯ altim⭈əd⭈ər }

gamma-ray detector [ENG] An instrument thatsubstances, usually the former; equal to 4.54609

⫻ 10⫺3cubic meter, or to 4.54609 liters; equal registers the presence of gamma rays {gam⭈

ə ra¯ ditek⭈tər }

to 160 fluid ounces Also known as imperial

gallon {gal⭈ən } gamma-ray level indicator [ENG]A level

indica-tor in which the rising level of the liquid or other

Galton whistle [ENG ACOUS] A short cylindrical

pipe with an annular nozzle, which is set into material reduces the amount of radiation

pass-ing from a gamma-ray source through the resonant vibration in order to generate ultra-

con-sonic sound waves {go˙l⭈tən wis⭈əl } tainer to a Geiger counter or other radiation

de-tector {gam⭈ə ra¯ ¦lev⭈əl in⭈dəka¯d⭈ər }

galvanic [ELEC] Pertaining to electricity flowing

as a result of chemical action { galvan⭈ik } gamma-ray probe [ENG] A gamma-ray counter

built into a watertight case small enough to be

galvanic battery [ELEC] A galvanic cell, or two

or more such cells electrically connected to pro- lowered into a borehole {gam⭈ə ra¯ pro¯b }

gamma-ray tracking [ENG] Use of threeduce energy { galvan⭈ik bad⭈ə⭈re¯ }

galvanic cell [ELEC] An electrolytic cell that is tracking stations, located at the three corners of

a triangle centered on a missile about to becapable of producing electric energy by electro-

chemical action { galvan⭈ik sel } launched, to obtain accurate azimuthal tracking

of a cobalt-60 gamma source in the tail

galvanic couple [ELEC] A pair of unlike

sub-stances, such as metals, which generate a volt- {gram⭈ə ra¯ trak⭈iŋ }

gamma-ray well logging [ENG]Measurementage when brought in contact with an electrolyte

{ galvan⭈ik kəp⭈əl } of gamma-ray intensity versus depth down the

wellbore; used to identify rock strata, their

posi-galvanic current [ELEC]A steady direct current

{ galvan⭈ik kə⭈rənt } tion, and their thicknesses {gam⭈ə ra¯ wel

la¨g⭈iŋ }

galvanometer [ENG] An instrument for

indicat-ing or measurindicat-ing a small electric current by gammeter [ENG] A template fashioned of

trans-parent material and marked with a calibratedmeans of a mechanical motion derived from

electromagnetic or electrodynamic forces pro- scale; when positioned on a sensitometric curve

it is used to determine the slope of the duced by the current {gal⭈vəna¨m⭈əd⭈ər }

straight-galvanometer recorder [ENG ACOUS]A sound line portion {game¯d⭈ər }

gang [ELEC]A mechanical connection of two orrecorder in which the audio signal voltage is

applied to a coil suspended in a magnetic field; more circuit devices so that they can be varied

at the same time { gaŋ }the resulting movements of the coil cause a tiny

attached mirror to move a reflected light beam gang chart [IND ENG] A multiple-activity

proc-ess chart used for groups of men on back and forth across a slit in front of a moving

materials-photographic film {gal⭈vəna¨m⭈əd⭈ər riko˙rd⭈ handling operations {gaŋ cha¨rt }

gang drill [MECH ENG]A set of drills operated

ər }

gambrel roof [BUILD] A roof with two sloping together in the same machine; used in rock

dril-ling {gaŋ dril }sides stepped at different angles on each side

of the center ridge; the lower slope is steeper gang milling [ENG] Rolling of material by

means of a composite machine with numerousthan the upper slope {gam⭈brəl ru¨f }

gamma [MECH] A unit of mass equal to 10⫺6 cutting blades {gaŋ mil⭈iŋ }

gang saw [MECH ENG] A steel frame in whichgram or 10⫺9kilogram {gam⭈ə }

thin, parallel saws are arranged to operate simul- material and designed for insertion into a

pipe-line followed by inflation to halt the flow of gas.taneously in cutting logs {gaŋ so˙ }

{gas bag }

gantlet [CIV ENG] A stretch of overlapping

rail-gas bearing [MECH ENG]A journal or thrustroad track, with one rail of one track being be-

bearing lubricated with gas Also known as tween the two rails of another track; used over

gas-lubricated bearing {gas ber⭈iŋ }narrow bridges and passes {go˙nt⭈lət }

gas burner [ENG] A hole or a group of holes

gantry [ENG] A frame erected on side supports

through which a combustible gas or gas-air

mix-so as to span an area and support and hoist

ture flows and burns {gas bər⭈nər }machinery and heavy materials {gan⭈tre¯ }

gas cleaning [ENG]Removing ingredients,

pol-gantry crane [MECH ENG] A bridgelike hoisting

lutants, or contaminants from domestic and machine having fixed supports or arranged for

in-dustrial gases {gas kle¯n⭈iŋ }running along tracks on ground level {gan⭈ gas-compression cycle [MECH ENG] A refriger-

gantry-type robot [CONT SYS] A

continuous-cooled in a heat exchanger, then passes into apath, Cartesian-coordinate robot constructed in gas expander which provides an exhaust stream

a bridge shape that uses rails to move along of cold gas to another heat exchanger that

han-a single horizonthan-al han-axis or han-along either of two dles the sensible-heat refrigeration effect andperpendicular horizontal axes {gan⭈tre¯ ¦tı¯p exhausts the gas to the compressor. {¦gas

Gantt chart [IND ENG] In production planning gas compressor [MECH ENG] A machine thatand control, a type of bar chart depicting the increases the pressure of a gas or vapor by in-work planned and done in relation to time; each creasing the gas density and delivering the fluiddivision of space represents both a time interval against the connected system resistance. {gasand the amount of work to be done during that kəmpres⭈ər }

interval {gant cha¨rt } gas constant [THERMO] The constant of

pro-Gantt task and bonus plan [IND ENG] A wage portionality appearing in the equation of stateincentive plan in which high task efficiency is of an ideal gas, equal to the pressure of the gasmaintained by providing a percentage bonus as times its molar volume divided by its tempera-

a reward for production in excess of standard ture Also known as gas-law constant; universal

gas constant {gas ka¨n⭈stənt }{gant ¦task ən bo¯⭈nəs plan }

gas cycle [THERMO] A sequence in which a

gas-gap [ELEC]The spacing between two electric

eous fluid undergoes a series of thermodynamiccontacts { gap }

phases, ultimately returning to its original state

gap-filler radar [ENG]Radar used to fill gaps in

{gas sı¯⭈kəl }radar coverage of other radar {gap fil⭈ər

gas cylinder [MECH ENG]The chamber in which

ra¯da¨r }

a piston moves in a positive displacement

en-gap-framepress [MECH ENG] A punch press

gine or compressor {gas sil⭈ən⭈dər }whose frame is open at bed level so that wide

gas dehydrator [CHEM ENG] A device or systemwork or strip work can be inserted {¦ga¯p

to remove moisture vapor from a gas stream,

fra¯mpres }

usually incorporates desiccant-type packed

gap lathe [MECH ENG] An engine lathe with a

towers {gas de¯hı¯dra¯d⭈ər }sliding bed providing enough space for turning

gas-deviation factor See compressibility factor.

large-diameter work {gap la¯th }

{¦gas de¯⭈ve¯a¯⭈shən fak⭈tər }

gap scanning [ENG]In ultrasonic testing, a

gas engine [MECH ENG]An internal coupling technique in which a sound beam is

combus-tion engine that uses gaseous fuel {gasprojected through a short fluid column that flows en⭈jən }

through a nozzle on an ultrasonic search unit

gaseous conduction analyzer [ENG] A device{gap skan⭈iŋ } to detect organic vapors in air by measuring the

garnet hinge [DES ENG]A hinge with a vertical

change in current that flows between a heatedbar and horizontal strap {ga¨r⭈nət hinj } platinum anode and a concentric platinum cath-

garretthe roof.[BUILD{gar⭈ət }]The part of a house just under ode. {¦gash⭈əs kən¦dək⭈shən an⭈əlı¯z⭈ər }

gaseous diffusion [CHEM ENG] 1.

Pressure-in-garter spring [DES ENG] A closed ring formed duced free-molecular transfer of gas through

mi-of helically wound wire {ga¨rd⭈ər spriŋ } croporous barriers as in the process of making

gas absorption operation [CHEM ENG]The re- fissionable fuel. 2.Selective solubility covery of solute gases present in gaseous mix- sion of gas through nonporous polymers by ab-tures of noncondensables; this recovery is gener- sorption and solution of the gas in the polymerally achieved by contacting the gas stream with matrix. {¦gash⭈əs difyu¨⭈zhən }

diffu-a liquid thdiffu-at offers specific or selective solubility gas etching [ENG] The removal of material fromfor the solute gas to be recovered, or with an a semiconductor circuit by reaction with a gasadsorbent (for example, synthetic or natural zeo- that forms a volatile compound. {gas ech⭈iŋ }lite) that accepts only specific molecule sizes or GasFET [ENG] A gas sensor based on changes,shapes {gas əbso˙rp⭈shən a¨p⭈əra¯⭈shən } upon exposure to hydrogen, in the surface part

of the work function of a palladium component

gas bag [ENG] A bag made of gas-impermeable

gas-filled thermometer

that serves as the gate contact of a metal oxide a filter and a bed of adsorbent material

{gas mask }semiconductor field-effect transistor (MOS-

gas meter [ENG]An instrument for measuringFET) {gasfet }

and recording the amount of gas flow through a

gas-filled thermometer [ENG] A thermometer

pipe {gas me¯d⭈ər }which uses a gas (usually nitrogen or hydrogen),

gasoline engine [MECH ENG]An internal that approximately follows the ideal gas law

com-bustion engine that uses a mixture of air and{gas fild thərma¨m⭈əd⭈ər }

gasoline vapor as a fuel {gas⭈əle¯n en⭈jən }

gas filter [CHEM ENG] A device used to remove

gasoline pump [MECH ENG] A device thatliquid or solid particles from a flowing gas

pumps and measures the gasoline supplied tostream {gas fil⭈tər }

a motor vehicle, as at a filling station {gas⭈

gas furnace [ENG] An enclosure in which a

gas-əle¯n pəmp }eous fuel is burned {gas fər⭈nəs }

gasometer [ENG] A piece of equipment that

gas generator [CHEM ENG]A chemical plant for

holds and measures gas; may be used in producing gas from coal, for example, water

analyti-cal chemistry to measure the quantity of gasgas [MECH ENG]An apparatus that supplies

evolved in a reaction { gasa¨m⭈əd⭈ər }

a high-pressure gas flow to drive compressors,

gas packing [IND ENG]Packing a material suchairscrews, and other machines {gas jen⭈ə

as food in an atmosphere consisting of an

oxy-ra¯d⭈ər }

gen-free gas {gas pak⭈iŋ }

gas heater [MECH ENG] A unit heater designed

gas pliers [DES ENG] Pliers for gripping round

to supply heat by forced convection, using gas

objects such as pipes, tubes, and circular rods

as a heat source {gas he¯d⭈ər } {gas plı¯⭈ərz }

gas holder [ENG] Gas storage container with

gas producer [CHEM ENG]A device for vertically free top section that moves up or down

com-plete gasification of coal by utilizing

simultane-to adjust simultane-to the volume of gas held {gas ously the air and water-gas reactions. {gas

gas hole [ENG]A cavity formed in a casting as

gas reversion [CHEM ENG] A process which

a result of cavitation {gas ho¯l } combines thermal cracking or reforming of

naph-gasification [CHEM ENG] Any chemical or heat

tha with thermal polymerization or alkylation ofprocess used to convert a substance to a gas;

hydrocarbon gases carried out in the same coal is converted by the Hygas process to a gas- tion zone. {gas rivər⭈zhən }

reac-eous fuel {gas⭈ə⭈fəka¯⭈shən } gas scrubbing [CHEM ENG]Removal of

gas-gasifier [CHEM ENG]A unit for producing gas, eous or liquid impurities from a gas by the actionparticularly synthesis gas from coal {gas⭈ of a liquid; the gas is contacted with the liquid

gas injection [MECH ENG] Injection of gaseous by chemical combination. {gas skrəb⭈iŋ }fuel into the cylinder of an internal combustion gas seal [ENG] A seal which prevents gas fromengine at the appropriate part of the cycle leaking to or from a machine along a shaft.

gasket [ENG] A packing made of deformable gassing [ELEC] The evolution of gas in the formmaterial, usually in the form of a sheet or ring, of small bubbles in a storage battery when charg-used to make a pressure-tight joint between sta- ing continues after the battery has been com-tionary parts Also known as static seal pletely charged. [ENG]1.Absorption of gas

gas law [THERMO] Any law relating the pres- a material. 3.Evolution of gas from a materialsure, volume, and temperature of a gas during a process or procedure. {gas⭈iŋ }{gas lo˙ } gas tank [ENG] A tank for storing gas or gaso-

gas-law constant See gas constant. {gas lo˙ line {gas taŋk }

gas lift [CHEM ENG] Solids movement opera- temperature by measuring the pressure exertedtion in which an upward-flowing gas stream in by a definite amount of gas enclosed in a con-

a closed conduit or vessel is used to lift and stant volume; the gas (preferably hydrogen ormove powdered or granular solid material helium) is enclosed in a glass or fused-quartz

gas making [CHEM ENG] Making water gas or known as constant-volume gas thermometer.air gas by the action of steam and air upon hot {¦gas thərma¨m⭈əd⭈ər }

coke {gas ma¯k⭈iŋ } gas thermometry [ENG] Measurement of

tem-gas manometer [ENG] A gage for determining peratures with a gas thermometer; used withthe difference in pressure of two gases, usually helium down to about 1 K {¦gas thərma¨m⭈

by measuring the difference in height of liquid ə⭈tre¯ }

columns in the two sides of a U-tube {¦gas gas trap [CIV ENG] A bend or chamber in a drainməna¨m⭈əd⭈ər } or sewer pipe that prevents sewer gas from es-

gas mask [ENG]A device to protect the eyes caping {gas trap }

and respiratory tract from noxious gases, vapors, gas-treating system [CHEM ENG]A process

system to remove nonhydrocarbon impuritiesand aerosols, by removing contamination with

gear drive

(such as water vapor, hydrogen sulfide, or carbon high-quality glass to be taken from the center

{gath⭈ə⭈riŋ riŋ }dioxide) from wellhead gas {gas tre¯d⭈iŋ

gating [ELECTR] The process of selecting those

sis⭈təm }

portions of a wave that exist during one or more

gas-tube boiler See waste-heat boiler. {gas

selected time intervals or that have magnitudes

tu¨b bo˙ilər }

between selected limits [ENG] A network of

gas turbine [MECH ENG]A heat engine that

connecting channels, including sprues, runners,converts the energy of fuel into work by using

gates, and cavities, which conduct molten metalcompressed, hot gas as the working medium and

to the mold {ga¯d⭈iŋ }that usually delivers its mechanical output

gating waveformSee gate. {¦ga¯d⭈iŋ wa¯vfo˙rm }power either as torque through a rotating shaft

Gaussian weighing method [ENG] A method(industrial gas turbines) or as jet power in the

used to determine the accuracy of equal-armform of velocity through an exhaust nozzle (air-

balances and to test standard weights in whichcraft jet engines) Also known as combustion

the sample is placed on one pan and the turbine {gas tər⭈bən }

compar-ative weights on the other, and then the weights

gas-turbine nozzle [MECH ENG] The

compo-are interchanged in a second weighing {gau˙s⭈nent of a gas turbine in which the hot, high-

e¯⭈ən wa¯⭈iŋ meth⭈əd }pressure gas expands and accelerates to high

gaussmeter [ENG]A magnetometer whosevelocity {gas tər⭈bən na¨z⭈əl }

scale is graduated in gauss or kilogauss, and

gas valve [ENG]An exhaust valve, held shut by

usually measures only the intensity, and not therubber springs, used to discharge gas from the

direction, of the magnetic field {gau˙sme¯d⭈extreme top of a balloon {gas valv } ər }

gas vent [ENG]A pipe or hole that allows gas

Gauss method of weighingSee double weighing.

to pass off {gas vent } {¦gau˙s ¦meth⭈əd əv wa¯⭈iŋ }

gate [CIV ENG] A movable barrier across an

Gauss’ principle of least constraint [MECH]opening in a large barrier, a fence, or a wall

The principle that the motion of a system of[ELECTR] 1.A circuit having an output and a

interconnected material points subjected to anymultiplicity of inputs and so designed that the

influence is such as to minimize the constraintoutput is energized only when a certain combina-

on the system; here the constraint, during antion of pulses is present at the inputs 2.A

infinitesimal period of time, is the sum over thecircuit in which one signal, generally a square points of the product of the mass of the pointwave, serves to switch another signal on and times the square of its deviation from the posi-off 3.One of the electrodes in a field-effect tion it would have occupied at the end of thetransistor 4.An output element of a cryotron time period if it had not been connected to other

5.To control the passage of a pulse or signal points. {gau˙s prin⭈sə⭈pəl əv ¦le¯st kənstra¯nt }

6.In radar, an electric waveform which is applied Gay-Lussac’s second law [THERMO]The law

to the control point of a circuit to alter the mode that the internal energy of an ideal gas is

inde-of operation inde-of the circuit at the time when the pendent of its volume. {ga¯⭈lu˙sa¨ks sek⭈əndwaveform is applied Also known as gating lo˙ }

waveform [ENG]1.A device, such as a valve Gay-Lussac tower [CHEM ENG] A component

or door, for controlling the passage of materials part in the chamber process for sulfuric acid through a pipe, channel, or other passageway duction that absorbs nitrogen oxides to form

pro-2.A device for positioning the film in a camera, nitrous vitriol. {ga⭈lu˙sa¨k tau˙⭈ər }

printer, or projector { ga¯t } g-calSee calorie. {je¯kal }

gate-array device [ELECTR]An integrated logic g-cmSee gram-centimeter.

circuit that is manufactured by first fabricating gear [DES ENG]A toothed machine element

a two-dimensional array of logic cells, each of used to transmit motion between rotating shaftswhich is equivalent to one or a few logic gates, when the center distance of the shafts is not tooand then adding final layers of metallization that large. [MECH ENG] 1. A mechanism per-determine the exact function of each cell and forming a specific function in a machine. 2.Aninterconnect the cells to form a specific network adjustment device of the transmission in a motorwhen the customer orders the device {ga¯t vehicle which determines mechanical advantage,əra¯ divı¯s } relative speed, and direction of travel { gir }

Gates crusher [MECH ENG] A gyratory crusher gear case [MECH ENG]An enclosure, usuallywhich has a cone or mantle that is moved eccen- filled with lubricating fluid, in which gears oper-trically by the lower bearing sleeve {ga¯ts ate {gir ka¯s }

gate valve [MECH ENG] A valve with a disk- cutting teeth in a gear {gir kəd⭈ər }shaped closing element that fits tightly over an gear cutting [MECH ENG] The cutting or form-opening through which water passes {ga¯t ing of a uniform series of toothlike projections

gathering iron [ENG] A rod used to collect mol- gear down [MECH ENG] To arrange gears so theten glass for glassblowing {gath⭈ə⭈riŋ ı¯⭈ərn } driven part rotates at a slower speed than the

gathering ring [ENG] A clay ring placed on mol- driving part {¦gir dau˙n }

gear drive [MECH ENG]Transmission of motionten glass to collect impurities and thus permit

geared turbine

or torque from one shaft to another by means complementary projections on another wheel to

transmit force and motion {gir te¯th }

of direct contact between toothed wheels

gear train [MECH ENG] A combination of two or{gir drı¯v }

more gears used to transmit motion between

geared turbine [MECH ENG]A turbine

con-two rotating shafts or between a shaft and anected to a set of reduction gears {¦gird

slide {gir tra¯n }

tər⭈bən }

gear up [MECH ENG]To arrange gears so that

gear forming [MECH ENG] A method of gear

the driven part rotates faster than the drivingcutting in which the desired tooth shape is pro-

part {¦gir əp }duced by a tool whose cutting profile matches

gear wheel [MECH ENG]A wheel that meshesthe tooth form {gir fo˙r⭈miŋ }

gear teeth with another part {gir we¯l }

gear generating [MECH ENG] A method of gear

geepoundSee slug. {je¯pau¨nd }cutting in which the tooth is produced by the

Geiger-Mu ¨ller probe [ENG] A Geiger-Mu¨llerconjugate or total cutting action of the tool plus

counter in a watertight container, lowered intothe rotation of the workpiece {gir jen⭈ə

a borehole to log the intensity of the gamma rays

ra¯d⭈iŋ }

emitted by radioactive substances in traversed

gear grinding [MECH ENG]A gear-cutting

rock Also known as electronic logger; Geigermethod in which gears are shaped by formed

probe {¦gı¯⭈gər myu¨l⭈ər pro¯b }grinding wheels and by generation; primarily a

Geiger probeSee Geiger-Mu¨ller probe. {gı¯⭈gərfinishing operation {gir grı¯nd⭈iŋ } pro¯b }

gear hobber [MECH ENG]A machine that mills

Geissler pump [ENG]A type of air pump thatgear teeth; the rotational speed of the hob has

uses the principle of the Torricellian vacuum,

a precise relationship to that of the work {gir and in which the vacuum is produced by the flow

gearing [MECH ENG] A set of gear wheels

adjustable and a fixed reservoir {gı¯s⭈lər

gearing chain [MECH ENG] A continuous chain

gelatinize [ENG] To coat or treat with a solutionused to transmit motion from one toothed

of gelatin { jəlat⭈ənı¯z }wheel, or sprocket, to another {gir⭈iŋ cha¯n } gelation time [CHEM ENG] In the manufacture

gearless traction [MECH ENG] Direct drive,

of a thermosetting resin, the time interval without reduction gears {¦gir⭈ləs trak⭈shən } tween the addition of the catalyst into a liquid

be-gear level [MECH ENG]To arrange gears so that adhesive system and the formation of a gel.the driven part and driving part turn at the same { jəla¯⭈shən tı¯m }

speed {gir lev⭈əl } GEMSee air-cushion vehicle.

gear loading [MECH ENG] The power transmit- gender [ELEC]The classification of a connectorted or the contact force per unit length of a gear as female or male. {jen⭈dər }

{gir lo¯d⭈iŋ } gender changer [ELEC]A small passive device

gear meter [ENG] A type of positive-displace- that is placed between two connectors of thement fluid quantity meter in which the rotating same gender to enable them to be joined. Alsoelements are two meshing gear wheels {gir known as cable matcher. {jen⭈dər cha¯n⭈jər }

vari-gearmotor [MECH ENG]A motor combined with ables used to specify the position and

orienta-a set of speed-reducing georienta-ars {girmo¯d⭈ər } tion of a system, in principle defined in terms

gear pump [MECH ENG]A rotary pump in which of Cartesian coordinates of the system’s particlestwo meshing gear wheels contrarotate so that and of the time in some convenient manner; thethe fluid is entrained on one side and discharged number of such coordinates equals the number

on the other {gir pəmp } of degrees of freedom of the system Also known

gear ratio [MECH ENG] The ratio of the angular as Lagrangian coordinates. {jen⭈rəlı¯zd ko¯speed of the driving member of a gear train or o˙rd⭈ən⭈əts }

similar mechanism to that of the driven member; generalized force [MECH]The generalizedspecifically, the number of revolutions made by force corresponding to a generalized coordinatethe engine per revolution of the rear wheels of is the ratio of the virtual work done in an infini-

an automobile {gir ra¯⭈sho¯ } tesimal virtual displacement, which alters that

gear shaper [MECH ENG]A machine that makes coordinate and no other, to the change in thegear teeth by means of a reciprocating cutter that coordinate {jen⭈rəlı¯zd fo˙rs }

rotates slowly with the work {gir sha¯p⭈ər } generalized momentum See conjugate

momen-gear-shaving machine [MECH ENG] A finishing tum {jen⭈rəlı¯zd məment⭈əm }

machine that removes excess metal from ma- generalized velocity [MECH] The derivativechined gears by the axial sliding motion of a with respect to time of one of the generalizedstraight-rack cutter or a circular gear cutter coordinates of a particle Also known as La-{gir sha¯v⭈iŋ məshe¯n } grangian generalized velocity {jen⭈rəlı¯zd və

gearshift [MECH ENG]A device for engaging la¨s⭈əd⭈e¯ }

and disengaging gears {girshift } general manager [IND ENG]The person of

gen-gear teeth [DES ENG] Projections on the cir- eral authority who performs all reasonable tasks

in conducting the usual and customary businesscumference or face of a wheel which engage with

of the principal head or owner {¦jen⭈rəl man⭈ conductive seawater by the magnetic field of

the earth {¦je¯⭈o¯⭈mag¦ned⭈ik i¦lek⭈trə⭈kəned⭈əə⭈jər }

generating magnetometer [ENG] A magnetom- graf }

geomembrane [CIV ENG] Any impermeableeter in which a coil is rotated in the magnetic

field to be measured with the resulting generated membrane (usually made of synthetic polymers

in sheets) used with soils, rock, earth, or othervoltage being proportional to the strength of the

magnetic field {jen⭈əra¯d⭈iŋ mag⭈nəta¨m⭈əd⭈ geotechnical material in order to block the

mi-gration of fluids {je¯⭈o¯membra¯n }

ər }

generating plantSee generating station. {jen⭈ geometric construction [ENG]Construction

that employs only straightedge and compassesəra¯d⭈iŋ plant }

generating station [MECH ENG] A stationary or is carried out by drawing only straight lines

and circles {¦je¯⭈ə¦me⭈trik kənstrək⭈shən }plant containing apparatus for large-scale con-

version of some form of energy (such as hydrau- geometric programming [SYS ENG] A nonlinear

programming technique in which the relativelic, steam, chemical, or nuclear energy) into elec-

trical energy Also known as generating plant; contribution of each of the component costs is

first determined; only then are the variables inpower station {jen⭈əra¯d⭈iŋ sta¯⭈shən }

generation rate [ELECTR] In a semiconductor, the component costs determined {¦je¯⭈ə¦me⭈

trikpro¯ gram⭈iŋ }the time rate of creation of electron-hole pairs

{jen⭈əra¯⭈shən ra¯t } geophysical engineering [ENG]A branch of

en-gineering that applies scientific methods for

lo-generator [ELEC]A machine that converts

me-chanical energy into electrical energy; in its com- cating mineral deposits {¦je¯⭈ə¦fiz⭈ə⭈kəl en⭈

jənir⭈iŋ }monest form, a large number of conductors are

mounted on an armature that is rotated in a geophysical prospecting [ENG]Application of

quantitative concepts and principles of physicsmagnetic field produced by field coils Also

known as dynamo; electric generator and mathematics in geologic explorations to

dis-cover the character of and mineral resources in[ELECTR] 1.A vacuum-tube oscillator or any

other nonrotating device that generates an alter- underground rocks in the upper portions of the

earth’s crust {¦je¯⭈ə¦fiz⭈ə⭈kəl pra¨spek⭈tiŋ }nating voltage at a desired frequency when ener-

gized with direct-current power or low-frequency geosynthetic [CIV ENG] Any synthetic material

used in geotechnical engineering, such as alternating-current power 2.A circuit that gen-

geo-erates a desired repetitive or nonrepetitive textiles and geomembranes {je¯⭈o¯⭈sinthed⭈

ik }waveform, such as a pulse generator {jen⭈

sci-entific methods and engineering principles to

generator set [ENG] The aggregate of one or

more generators together with the equipment civil engineering problems through acquiring,

in-terpreting, and using knowledge of materials ofand plant for producing the energy that drives

them {jen⭈əra¯d⭈ər set } the crust of the earth {¦je¯⭈o¯¦tek⭈niks }

geotechnology [ENG] Application of the

meth-geochemical prospecting [ENG] The use of

geochemical and biogeochemical principles and ods of engineering and science to exploitation

of natural resources {¦je¯⭈o¯⭈tekna¨l⭈ə⭈je¯ }data in the search for economic deposits of min-

erals, petroleum, and natural gases {¦je¯⭈ geotextiles [CIV ENG]Woven or nonwoven

fab-rics used with foundations, soils, rock, earth, oro¯¦kem⭈ə⭈kəl pra¨spek⭈ting }

geochemical well logging [ENG]Well logging other geotechnical material as an integral part

of a manufactured project, structure, or system.dependent on geochemical analysis of the data

{¦je¯⭈o¯¦kem⭈ə⭈kəl wel la¨g⭈iŋ } Also known as civil engineering fabrics; erosion

control cloth; filter fabrics; support membranes

geodetic survey [ENG]A survey in which the

figure and size of the earth are considered; it is {¦je¯⭈o¯¦tekstı¯lz }

geothermal prospecting [ENG] Exploration forapplicable for large areas and long lines and

is used for the precise location of basic points sources of geothermal energy {¦je¯⭈o¯¦thər⭈məl

pra¨spek⭈tiŋ }suitable for controlling other surveys {¦je¯⭈

ə¦ded⭈ik sərva¯ } geothermal well logging [ENG] Measurement

of the change in temperature of the earth by

geographical mile [MECH] The length of 1

min-ute of arc of the Equator, or 6087.08 feet (1855.34 means of well logging {¦je¯⭈o¯¦thər⭈məl wel

la¨g⭈iŋ }meters), which approximates the length of the

nautical mile {¦je¯⭈ə¦graf⭈ə⭈kəl mı¯l } geothermometer [ENG] A thermometer

con-structed to measure temperatures in boreholes

geologic thermometerSee geothermometer. {¦je¯⭈

ə¦la¨j⭈ik thərma¨m⭈əd⭈ər } or deep-sea deposits {¦je¯⭈o¯⭈thərma¨m⭈əd⭈ər }

gerber beam [CIV ENG] A long, straight beam

geolograph [ENG] A device that records the

penetration rate of a bit during the drilling of a that functions essentially as a cantilevered beam

by the insertion of two hinges in alternate spans.well { je¯a¨l⭈əgraph }

geomagnetic electrokinetograph [ENG] An in- {gər⭈bər be¯m }

get [IND ENG] A combination of two or more ofstrument that can be suspended from the side

of a ship to measure the direction and speed of the elemental motions of search, select, grasp,

transport empty, and transport loaded; appliedocean currents while the ship is under way by

measuring the voltage induced in the moving to time-motion studies { get }

getter-ion pump

getter-ion pump [ENG] A high-vacuum pump Gilbreth’s micromotion study [IND ENG] A timethat employs chemically active metal layers and motion study based on the concept that allwhich are continuously or intermittently depos- work is performed by using a relatively few basicited on the wall of the pump, and which chemi- operations in varying combinations and se-sorb active gases while inert gases are ‘‘cleaned quence; basic elements (therbligs) include grasp,up’’ by ionizing them in an electric discharge and search, move, reach, and hold {gil⭈brəths ¦mı¯⭈drawing the positive ions to the wall, where the kro¯¦mo¯⭈shən stəd⭈e¯ }

neutralized ions are buried by fresh deposits of gill [MECH] 1.A unit of volume used in themetal Also known as sputter-ion pump United States for the measurement of liquid sub-{¦ged⭈ər ¦ı¯a¨n pəmp } stances, equal to 1/4 U.S liquid pint, or to

getter sputtering [ELECTR]The deposition of 1.1829411825⫻ 10⫺4cubic meter 2.A unit ofhigh-purity thin films at ordinary vacuum levels volume used in the United Kingdom for the

by using a getter to remove contaminants re- measurement of liquid substances, and maining in the vacuum {gəd⭈ər spəd⭈ə⭈riŋ } sionally of solid substances, equal to 1/4 U.K.

occa-gewel hinge [DES ENG]A hinge consisting of a pint, or to approximately 1.420653125⫻ 10⫺4

hook inserted in a loop {ju¨⭈əl hinj } cubic meter. { gil }

gfSee gram-force. Gilliland correlation [CHEM ENG]

Approxima-Giaque’s temperature scale [THERMO]The in- tion method for distillation-column calculations;ternationally accepted scale of absolute temper- correlates reflux ratio and number of plates forature, in which the triple point of water is defined the column as functions of minimum reflux and

to have a temperature of 273.16 K {¦zhya¨ks minimum plates. { gəlil⭈ənd ka¨⭈rəla¯⭈shən }

tem⭈prə⭈chər ska¯l } gill net [ENG] A net that entangles the gill

cov-gibother parts in place or act as a bearing or wear[ENG]A removable plate designed to hold ers of fish. {gil net }

Gilmour heat-exchange method [ENG] surface { gib } mal design method for heat exchangers by solu-

Ther-Gibbs apparatus [ENG] A compressed-oxygen tion of five unique equations containing a breathing apparatus used by miners in the mum number of variables and involving tube-United States {gibz ap⭈ərad⭈əs } side, shell-side, tube-wall, and dirt resistance.

mini-Gibbs diaphragm cellelectrolytic diaphragm cell for chlorine produc-[CHEM ENG]A type of {gil⭈mo˙r he¯t ikscha¯nj meth⭈əd }

gimbal [ENG]1.A device with two mutually tion, with graphite electrodes and a cylindrical

per-pendicular and intersecting axes of rotation, thusshape {gibz dı¯⭈əfram sel }

giving free angular movement in two directions,

Gibbs free energy [THERMO]The

thermody-on which an engine or other object may be

namic function G ⫽ H ⫺ TS, where H is enthalpy,

mounted 2.In a gyro, a support which provides

T absolute temperature, and S entropy. Also

the spin axis with a degree of freedom 3.Toknown as free energy; free enthalpy; Gibbs func-

move a reaction engine about on a gimbal so astion {gibz ¦fre¯ en⭈ər⭈je¯ }

to obtain pitching and yawing correction

mo-Gibbs function See Gibbs free energy. {gibz

ments 4.To mount something on a gimbal

fəŋk⭈shən }

{gim⭈bəl }

Gibbs-Helmholtz equation [THERMO]1.Either

gimbaled nozzle [MECH ENG] A nozzle

sup-of two thermodynamic relations that are useful

ported on a gimbal {gim⭈bəld na¨z⭈əl }

in calculating the internal energy U or enthalpy

gimbal freedom [ENG] Of a gyro, the maximum

H of a system; they may be written U ⫽

angular displacement about the output axis of

F ⫺ T(⭸F/⭸T) V and H ⫽ G ⫺ T(⭸G/⭸T) P , where F

a gimbal {gim⭈bəl fre¯⭈dəm }

is the free energy, G is the Gibbs free energy, T

gimbal lock [ENG]A condition of a

two-degree-is the absolute temperature, V two-degree-is the volume,

of-freedom gyro wherein the alignment of the

and P is the pressure. 2.Any of the similar

spin axis with an axis of freedom deprives theequations for changes in thermodynamic poten-

gyro of a degree-of-freedom and therefore itstials during an isothermal process {gibz hel-

useful properties {gim⭈bəl la¨k }mho¯lts ikwa¯⭈zhən }

gimlet [DES ENG]A small tool consisting of a

Giegy-Hardisty process [CHEM ENG] The

pro-threaded tip, grooved shank, and a cross handle;duction of sebacic acid from castor oil or its acids

used for boring holes in wood {gim⭈lət }

by reaction of the acid at a high temperature with

gimlet bit [DES ENG] A bit with a threaded pointcaustic alkali {ge¯⭈ge¯ ha¨r⭈də⭈ste¯ pra¨s⭈əs }

and spiral flute; used for drilling small holes in

Giesler coal test [ENG] A plastometric method

wood {gim⭈lət bit }for estimating the coking properties of coals

gin [MECH ENG] A hoisting machine in the form{ge¯s⭈lər ko¯l test }

of a tripod with a windlass, pulleys, and ropes

Gilbrethian variables [IND ENG] A system of

{ jin }three sets of variables that are considered to be

gin pole [MECH ENG]A hand-operated derrickintrinsic to every task: variables involving the

which has a nearly vertical pole supported by guyresponse of the worker to anatomic and psycho-

ropes; the load is raised on a rope that passeslogical factors, environmental variables, and

through a pulley at the top and over a winch atvariables of motion; used in analyzing and de-

the foot Also known as guyed-mast derrick;signing work systems { gilbreth⭈e¯⭈ən ver⭈e¯⭈

glue-line heating

gin tackle [MECH ENG]A tackle made for use metal, usually shaped like a triangle, used to

hold a pane of glass in place Also known aswith a gin {jin tak⭈əl }

Girbotal process [CHEM ENG]A regenerative sprig {gla¯⭈zərz po˙int }

glazing [ENG]1.Cutting and fitting panes ofabsorption process to remove carbon dioxide,

hydrogen sulfide, and other acid impurities from glass into frames 2.Smoothing the lead of a

wiped pipe joint by passing a hot iron over it.natural gas, using mono-, di-, or triethanolamine

as the reagent {gər⭈bəto˙l pra¨s⭈əs } {gla¯z⭈iŋ }

glazing barSee sash bar. {gla¯z⭈iŋ ba¨r }

girder [CIV ENG] A large beam made of metal or

concrete, and sometimes of wood {gər⭈dər } Gleason bevel gear system [DES ENG]The

standard for bevel gear designs in the United

girder clampSee beam clip. {gərd⭈ər klamp }

girder clipSee beam clip. {gərd⭈ər klip } States; employs a basic pressure angle of 20⬚

with long and short addenda for ratios other than

girt [CIV ENG] 1.A timber in the second-floor

corner posts of a house to serve as a footing for 1:1 to avoid undercut pinions and to increase

strength {gle¯s⭈ən ¦bev⭈əl ¦gir sis⭈təm }roof rafters 2.A horizontal member to stiffen

the framework of a building frame or trestle globe valve [MECH ENG]A device for regulating

flow in a pipeline, consisting of a movable [ENG]A brace member running horizontally be-

disk-tween the legs of a drill tripod or derrick { gərt } type element and a stationary ring seat in a

gen-erally spherical body {glo¯b valv }

gland [ENG] 1.A device for preventing leakage

at a machine joint, as where a shaft emerges glory hole [CIV ENG] A funnel-shaped,

fixed-crest spillway [ENG] A furnace for resofteningfrom a vessel containing a pressurized fluid

2.A movable part used in a stuffing box to com- or fire polishing glass during working, or an

en-trance in such a furnace {glo˙⭈re¯ ho¯l }press the packing { gland }

glare filter [ENG]A screen that is placed over glossimeter [ENG]An instrument, often

photo-electric, for measuring the ratio of the light the face of a cathode-ray tube to reduce glare

re-from ambient and overhead light {gler fil⭈ flected from a surface in a definite direction to

the total light reflected in all directions Alsotər }

glassblowing [ENG]Shaping a mass of viscid known as glossmeter { gla¨sim⭈əd⭈ər }

glossmeterSee glossimeter. {gla¨sme¯d⭈ər }glass by inflating it with air introduced through

a tube {glasblo¯⭈iŋ } glost firing [CHEM ENG]The process of glazing

and firing ceramic ware which has previously

glass cutter [ENG]A tool equipped with a steel

wheel or a diamond point used to cut glass been fired at a higher temperature {glo˙st

fı¯r⭈iŋ }{glaskəd⭈ər }

glassed steel [CHEM ENG] Process piping or glove box [ENG] A sealed box with gloves

attached and passing through openings into thevessels lined with glass; a glass-steel composite

has structural strength of steel and corrosion box, so that workers can handle materials in

the box; used to handle certain radioactive andresistance of glass {¦glast ¦ste¯l }

glass furnace [ENG] A large, covered furnace or biologically dangerous materials and to prevent

contamination of materials and objects such astank for melting large batches of glass, in which

heat is supplied by a flame playing over the glass germfree rats or lunar rocks {gləv ba¨ks }

Glover tower [CHEM ENG] A tower in the leadsurface, and regenerative heating of combustion

air and gas is usually employed Also known chamber process for manufacturing sulfuric acid;

in this tower the nitrogen oxide, sulfur dioxide,

as glass tank {glas fər⭈nəs }

glass heat exchanger [ENG] Any heat ex- and air mixture is passed upward and sprayed

with a sulfuric acid-nitrosyl sulfuric acid mixture.changer in which glass replaces metal, such as

shell-and-tube, cascade, double-pipe, bayonet, {gləv⭈ər tau˙⭈ər }

glow-discharge microphone [ENG ACOUS] and coil exchangers {¦glas he¯t ikscha¯n⭈jər }

Mi-glass pot [ENG] A crucible used for making crophone in which the action of sound waves on

the current forming a glow discharge betweensmall amounts of glass {glas pa¨t }

glass seal [ENG]An airtight seal made by mol- two electrodes causes corresponding variations

in the current {¦glo¯ ¦discha¨rj mı¯⭈krəfo¯n }ten glass {glas se¯l }

glass tankSee glass furnace. {glas taŋk } glowing combustion [CHEM ENG]A reaction

between oxygen or an oxidizer and the surface

glass-tube manometer [ENG] A manometer for

simple indication of difference of pressure, in of a solid fuel so that there is emission of heat

and light without a flame Also known as contrast to the metallic-housed mercury ma-

sur-nometer, used to record or control difference face burning {¦glo¯⭈iŋ kəmbəs⭈chən }

glow plug [MECH ENG]A small electric heater,

of pressure or fluid flow {glas tu¨b məna¨m⭈

preheats the air and aids the engine in starting

glaze [ENG]A glossy coating Also known as

glue blockSee angle block. {glu¨ bla¨k }

glazed [MECH ENG] Pertaining to an abrasive

surface that has become smooth and cannot glue-joint ripsaw [MECH ENG] A heavy-gage

rip-saw used on straight-line or self-feed rip abrade efficiently { gla¯zd }

ma-glazed frostSee glaze. {¦gla¯zd fro˙st } chines; the cut is smooth enough to permit

glu-ing of joints from the saw {glu¨ jo˙int ripso˙ }

glaze iceSee glaze. {gla¯z ı¯s }

glazier’s point [ENG] A small piece of sheet glue-line heating [ENG] Dielectric heating in