adjustable parallels Wedge-shaped iron block that is not completely cleared. the top face of the upper advance slope grouting ENGI A grouting tech- prevent shifting. i ajas-ta-bal 'pa the concrete is placed. f ad'vans slap tion of the arm can be changed to fo dz IDEs ENG] A cutting tool with a thin arched A wrench jaw which is fixed angles on the handle; used for rough dressing ENGI The part of or wood planing that carries the cutters ght in such a way that the indicated value erated flow ENGI Flowing liquid in which gas deviates as little as possible from the actual bubbles throughout the liq- uid. I'e, rad. fo J Causing air to bubb cal of impedance, it is expressed in siemens. aeration tank with o aerate its conten adobe construction BUILDI Wall construction another gas through the liquid or by spraying th sun-dried blocks of adobe soil. la'do-be DP See automatic data processing. fins ADR studio ENG ound-recording of soil from I 1. One who aera studio used in motion-picture and television 2. Equipment used for aeration. 3. Any device ENG Equipment used to inject compressed to sewage in treatment process eh for recreating the acous- aerial cableway See aerial tramway. I'e-re-ol tical liveness and background sound of the envi- ntwn tis postsyn chronaceng stu dit. io:a dersar surveying and mapmaking. [ -re-al,fot ENG A device that fies air by bringing it al,- ik lid adsorbing substance. I ad: as tropho- spark aissance ENGI The ob- hic reconnaissance constraints t risks. adkvanst pro./mad-ik aerial reconnais 'e real fod. 6. ri kan.3.sns e aphic means while aloft. i system up to which a train may proceed within
adjustable parallels adjustable parallels [ENG] Wedge-shaped iron block that is not completely cleared. { ədvans bars placed with the thin end of one on the thick signəl } end of the other, so that the top face of the upper advance slope grouting [ENG] A grouting techand the bottom face of the lower remain parallel, nique in which the front of the mass of grout is but the distance between the two faces is adjust- forced to move horizontally through preplaced able; the bars can be locked in position by a aggregate. { ədvans slo¯ p grau˙ diŋ } screw to prevent shifting. { əjəstəbəl par advance slope method [ENG] A method of con- əlelz } crete placement in which the face of the fresh adjustable square [ENG] A try square with an concrete, which is not vertical, moves forward arm that is at right angles to the ruler; the posi- as the concrete is placed. { ədvans slo¯ p tion of the arm can be changed to form an L or methəd } a T. Also known as double square. { əjəstə adz [DES ENG] A cutting tool with a thin arched bəl skwer } blade, sharpened on the concave side, at right adjustable wrench [ENG] A wrench with one angles on the handle; used for rough dressing jaw which is fixed and another which is adjust- of timber. { adz } able; the size is adjusted by a knurled screw. adz block [MECH ENG] The part of a machine { əjəstəbəl rench } for wood planing that carries the cutters. adjusting [ENG] In measurement technology, { adz bla¨ k } setting or compensating a measuring instrument aerated flow [ENG] Flowing liquid in which gas or a weight in such a way that the indicated value is dispersed as fine bubbles throughout the liq- deviates as little as possible from the actual uid. { era¯dəd flo¯ } value. { əjəstiŋ } aeration [ENG] 1. Exposing to the action of air. adjutage [ENG] A tube attached to a container 2. Causing air to bubble through. 3. Introduc- of liquid at an orifice to facilitate or regulate ing air into a solution by spraying, stirring, or outflow. { ajətazh } similar method. 4. Supplying or infusing with admittance [ELEC] A measure of how readily air, as in sand or soil. { era¯shən } alternating current will flow in a circuit; the recip- aeration tank [ENG] A fluid-holding tank with rocal of impedance, it is expressed in siemens. provisions to aerate its contents by bubbling air { ədmitəns } or another gas through the liquid or by spraying adobe construction [BUILD] Wall construction the liquid into the air. { era¯shən taŋk } with sun-dried blocks of adobe soil. { ədo¯be¯ aerator [DES ENG] A tool having a roller kənstrəkshən } equipped with hollow fins; used to remove cores ADP See automatic data processing. of soil from turf. [ENG] 1. One who aerates. ADR studio [ENG ACOUS] A sound-recording 2. Equipment used for aeration. 3. Any device studio used in motion-picture and television for supplying air or gas under pressure, as for production to allow an actor who did not intelli- fumigating, welding, or ventilating. [MECH gibly record his or her speech during the original ENG] Equipment used to inject compressed filming or video recording to do so by watching air into sewage in the treatment process. himself or herself on the screen and repeating { era¯dər } the original speech with lip synchronism; it is aerial cableway See aerial tramway. { ere¯əl equipped with facilities for recreating the acous- ka¯bəlwa¯ } tical liveness and background sound of the envi- aerial photogrammetry [ENG] Use of aerial ronment of the original dialog. Derived from photographs to make accurate measurements in automatic dialog replacement studio. Also surveying and mapmaking. { ere¯əl fo¯t known as postsynchronizing studio. { ¦a¯¦de¯a¨r əgramətre¯ } stu¨ de¯o¯ } adsorption system aerial photographic reconnaissance See aerial [MECH ENG] A device that dehumidifies air by bringing it into contact with photoreconnaissance. { ere¯əl fo¯ də¦grafik a solid adsorbing substance. { ad rika¨nəsəns } so˙rpshən aerial photography [ENG] The making of photo- sistəm } advance graphs of the ground surface from an aircraft, [CIV ENG] In railway engineering, a spacecraft, or rocket. Also known as aeropho- length of track that extends beyond the signal tography. { ere¯əl fəta¨grəfe¯ } that controls it. [MECH ENG] To effect the earlier occurrence of an event, for example, spark aerial photoreconnaissance [ENG] The obadvance or injection advance. { əd taining of information by air photography; vans } advanced programmatic risk analysis [IND the three types are strategic, tactical, and surENG] A method for managing engineering pro- vey-cartographic photoreconnaissance. Also grams with multiple projects and strict resource known as aerial photographic reconnaissance. constraints which balances both technical and { ere¯əl fo¯ do¯ rika¨nəsəns } management risks. { əd¦vanst pro¯grə¦madik aerial reconnaissance [ENG] The collection of risk ənaləsəs } information by visual, electronic, or photoadvanced sewage treatment See tertiary sewage graphic means while aloft. { ere¯əl rika¨nə treatment. { əd¦vanst su¨ij tre¯tmənt } səns } advance signal [CIV ENG] A signal in a block aerial ropeway See aerial tramway. { ere¯əl system up to which a train may proceed within a ro¯ pwa¯ } 10
afterfilter self-recording airborne station. Also known as aerosurvey recording of atmospheric pressure, temperature ir or other gases. so known as aerial cableway: aerial ropeway. orography See aerial photography. I NG A mechanic h-speed vehicles with of producing a system of dispersed phase nd dispersing medium, that is, an aerosol. engineering lENG Engineering per aerobic the earth of goes no ght of ENGI A pond in of missiles. earth satellites. and hile air or oxygen aerospace industry lENGI Industry aerobic condition ik an-2, robi aerobic digestion CHEM ENG suspended s I- ik da'jes chan aerobic lagoon p to 267 miles hich sewage solids are placed, and are decom- 430 kilometers) per hour. 'ero, tran j eter. Ies, the. pond See aerobic lagoon. (e'ro tion cl ENGI Treatment of sew. A frame BUILDI A dwelling whose main fra ra'na- shon 1 ported in an upright position by ee airport. and used for lift ment nce used f olant of the inability of the engine at rest I'af-tar, boil I ctory or aftert ourse significantly. after he deformation of eam power plants. owo-stage ejector: used in steel balls as crushing bodies: the dry load is on turbocharged engines. ('af-tor, kuil-or l airswept to remove mesh material, e ro, fol aftercooling MECH ENGI The cooling of a gas eu, often with recirculation. I'e:s团山mt49 known as final file甲 II
afterfilter aerial spud [MECH ENG] A cable for moving and aerograph [ENG] Any self-recording instrument anchoring a dredge. { ere¯əl spəd } carried aloft by any means to obtain meteoroaerial survey [ENG] A survey utilizing photo- logical data. { ero¯ graf } graphic, electronic, or other data obtained from aerometeorograph [ENG] A self-recording inan airborne station. Also known as aerosurvey; strument used on aircraft for the simultaneous air survey. { ere¯əl sərva¯ } recording of atmospheric pressure, temperature, aerial tramway [MECH ENG] A system for trans- and humidity. { erome¯de¯o˙rəgraf } porting bulk materials that consists of one or aerometer [ENG] An instrument to ascertain more cables supported by steel towers and is the weight or density of air or other gases. capable of carrying a traveling carriage from { era¨mədər } which loaded buckets can be lowered or raised. aerophotography See aerial photography. { ero¯ Also known as aerial cableway; aerial ropeway. fəta¨grəfe¯ } { ere¯əl tramwa¯ } aerosol generator [MECH ENG] A mechanical aeroballistics [MECH] The study of the interac- means of producing a system of dispersed phase tion of projectiles or high-speed vehicles with and dispersing medium, that is, an aerosol. the atmosphere. { ero¯bəlistiks } { erəso˙ l jenəra¯dər } aerobic-anaerobic interface [CIV ENG] That aerospace engineering [ENG] Engineering per- point in bacterial action in the body of a sewage taining to the design and construction of aircraft sludge or compost heap where both aerobic and and space vehicles and of power units, and to anaerobic microorganisms participate, and the the special problems of flight in both the earth’s decomposition of the material goes no further. atmosphere and space, as in the flight of air { ero¯ bik anəro¯ bik intərfa¯s } vehicles and in the launching, guidance, and aerobic-anaerobic lagoon [CIV ENG] A pond in control of missiles, earth satellites, and space which the solids from a sewage plant are placed vehicles and probes. { ¦ero¯ ¦spa¯s enjəniriŋ } in the lower layer; the solids are partially decom- aerospace industry [ENG] Industry concerned posed by anaerobic bacteria, while air or oxygen with the use of vehicles in both the earth’s at- is bubbled through the upper layer to create an mosphere and space. { ¦ero¯ ¦spa¯s indəstre¯ } aerobic condition. { ero¯ bik anəro¯ bik aerostatic balance [ENG] An instrument for ləgu¨ n } weighing air. { ¦ero¯ ¦stadik baləns } aerobic digestion [CHEM ENG] Digestion of aerosurvey See aerial survey. { ¦ero¯ ¦sərva¯ } matter suspended or dissolved in waste by aerotrain [ENG] A train that is propelled by a microorganisms under favorable conditions of fan jet engine and floats on a cushion of low- oxygenation. { ero¯ bik dəjeschən } pressure air, traveling at speeds up to 267 miles aerobic lagoon [CIV ENG] An aerated pond in (430 kilometers) per hour. { ero¯ tra¯n } which sewage solids are placed, and are decom- aesthesiometer See esthesiometer. { esthe¯ posed by aerobic bacteria. Also known as aero- ze¯a¨mədər } bic pond. { ero¯bik ləgu¨ n } affreightment [IND ENG] The lease of a vessel aerobic pond See aerobic lagoon. { e¦ro¯bik for the transportation of goods. { əfra¯tmənt } pand } Aframe [BUILD] A dwelling whose main frames aerochlorination [CIV ENG] Treatment of sew- are in the shape of the letter A. [ENG] Two age with compressed air and chlorine gas to remove fatty substances. { poles supported in an upright position by braces ero¯ klo˙rəna¯shən } or guys and used for lifting equipment. Also aerodrome See airport. { ero¯ dro¯ m } known as double mast. { a¯ fra¯m } aerodynamic balance [ENG] A balance used for afterboil [MECH ENG] In an automotive engine, the measurement of the forces exerted on the coolant boiling after the engine has stopped be- surfaces of instruments exposed to flowing air; frequently used in tests made on models in wind cause of the inability of the engine at rest to dissipate excess heat. { aftərbo˙ il } tunnels. { erodı¯namik baləns } aerodynamic trajectory afterburning [MECH ENG] Combustion in an in- [MECH] A trajectory or part of a trajectory in which the missile or vehicle ternal combustion engine following the maxiencounters sufficient air resistance to stabilize mum pressure of explosion. { aftərbərniŋ } its flight or to modify its course significantly. aftercondenser [MECH ENG] A condenser in { erodı¯namik trəjektre¯ } the second stage of a two-stage ejector; used in aeroelasticity [MECH] The deformation of steam power plants, refrigeration systems, and structurally elastic bodies in response to aerody- air conditioning systems. { aftərkəndens namic loads. { ero¯ilastisəde¯ } ər } aerofall mill [MECH ENG] A grinding mill of aftercooler [MECH ENG] A heat exchanger large diameter with either lumps of ore, pebbles, which cools air that has been compressed; used or steel balls as crushing bodies; the dry load is on turbocharged engines. { aftərku¨ lər } airswept to remove mesh material. { ero¯ fo˙ l aftercooling [MECH ENG] The cooling of a gas mil } after its compression. { aftərku¨ liŋ } aerofilter [CIV ENG] A filter bed for sewage treat- afterfilter [MECH ENG] In an air-conditioning ment consisting of coarse material and operated system, a high-efficiency filter located near a terat high speed, often with recirculation. { e minal unit. Also known as final filter. { af ro¯ filtər} tərfiltər } 11
afterrunning pe drain CIV El vel or the like: used for draining subsoil DNT SYS A of the piston after reaching the top of its stroke farm products and in an automotive engine. I'af-tar tap 'ded AGV See automated guided vehicle. agger CIV ENGI A material used for road aring elevation or range 吗32 GI A structure designed for an of motion of the tracking equipme四 hat fun- els the material to a gate under the structure or so as to minimize tracking error. ad-od A aggregate interlock ENG] Th naintain mutua ragat 'in-tar, lak rak- in me aided-tracking ratio ENG The ratio lop a program of output that will he constant velocity of the aided- tracking r er given constraints sm and the velocity of the moving target. i'ad-ad 'trak. in ra sho) EM ENG The JENG A slender form of drill use boring or drilling a blasthole in rock. f agwel I ate used as a measure of the corrosivity and neral topographic bon cr'spioperties of water. ("kar- ed with fine and coarse azimuth and a magnetic needle. am- in Operations that Can be rapidly reconfigured to satisfy changing aiming screws IMECH ENGI On an automotive the headlights in horizontal and ve storage for a perio mes with i anes. I'aim in, skruz become essent due to its use. 2. Operation of emerge at super- rate ot rota- NGI On certain tation of mixed t -a, tad agitating lECH ENG A vehicle carrying ously to agitate the contents. [ aj ially preform a sheet before it enters agitator MECH ENG A device for keeping liq- a' sist ' form in I lids and solids in liquids in motion by mixing. air-atomizing oil burner ENG An oil burner in body MECH ENG A truck-n ough the action of compressed air. rotati t f intemal ipad tles bo of the drum ete: air bag t mech engi an auto vents the setting of the mixture prior to I'aj- a, tad-or 'bad-e straint in the form of a bag which is automatically 12
afterrunning afterrunning [MECH ENG] In an automotive en- agricultural pipe drain [CIV ENG] A system of gine, continued operation of the engine after the porous or perforated pipes laid in a trench filled ignition switch is turned off. Also known as with gravel or the like; used for draining subsoil. dieseling; run-on. { aftərrəniŋ } { ¦agrə¦kəlchərəl pı¯p dra¯n } after top dead center [MECH ENG] The position agricultural robot [CONT SYS] A robot used to of the piston after reaching the top of its stroke pick and harvest farm products and fruits. { ¦ag in an automotive engine. { aftər ta¨p ded rə¦kəlchərəl ro¯ ba¨t } sentər } AGV See automated guided vehicle. agger [CIV ENG] A material used for road fill aided tracking [ENG] A system of radar-tracking over low ground. { ajər } a target signal in bearing, elevation, or range, or aggregate bin [ENG] A structure designed for any combination of these variables, in which the storing and dispensing dry granular construction rate of motion of the tracking equipment is ma- materials such as sand, crushed stone, and chine-controlled in collaboration with an opera- gravel; usually has a hopperlike bottom that fun- tor so as to minimize tracking error. { a¯dəd nels the material to a gate under the structure. trakiŋ } { agrəgət bin } aided-tracking mechanism [ENG] A device conaggregate interlock [ENG] The projection of ag- sisting of a motor and variable-speed drive which gregate particles or portions thereof from one provides a means of setting a desired tracking side of a joint or crack in concrete into recesses rate into a director or other fire-control instru- in the other side so as to effect load transfer in ment, so that the process of tracking is carried compression and shear, and to maintain mutual out automatically at the set rate until it is alignment. { agrəgət intərla¨ k } changed manually. { a¯dəd trakiŋ mek aggregate production scheduling [IND ENG] A ənizəm } type of planning at a broad level without consid- aided-tracking ratio [ENG] The ratio between eration of individual products and activities in the constant velocity of the aided-tracking mech- order to develop a program of output that will anism and the velocity of the moving target. meet future demand under given constraints. { a¯dəd trakiŋ ra¯sho¯ } { ¦agrigət prə¦dəkshən skejəliŋ } aiguille [ENG] A slender form of drill used for aggressive carbon dioxide [CHEM ENG] The boring or drilling a blasthole in rock. { a¯gwe¯l } carbon dioxide dissolved in water in excess of aiming circle [ENG] An instrument for measur- the amount required to precipitate a specified ing angles in azimuth and elevation in connec- concentration of calcium ions as calcium carbon- tion with artillery firing and general topographic ate; used as a measure of the corrosivity and work; equipped with fine and coarse azimuth scaling properties of water. { əgresiv ka¨r micrometers and a magnetic needle. { a¯miŋ bən dı¯a¨ ksı¯d } sərkəl } agile manufacturing [IND ENG] Operations that aiming screws [MECH ENG] On an automotive can be rapidly reconfigured to satisfy changing market demands. { vehicle, spring-loaded screws designed to secure ¦ajəl manyu¨ fakchəriŋ } headlights to a support frame and permit aiming aging [ELEC] Allowing a permanent magnet, of the headlights in horizontal and vertical capacitor, meter, or other device to remain in planes. { aimiŋ skru¨z } storage for a period of time, sometimes with a AIR See air-injection reactor. { er } voltage applied, until the characteristics of the air-actuated [ENG] Powered by compressed air. device become essentially constant. [ENG] { er akchəwa¯dəd } 1. The changing of the characteristics of a device air-arc furnace [ENG] An arc furnace designed due to its use. 2. Operation of a product before shipment to stabilize characteristics or detect to power wind tunnels, the air being superheated to 20,000 K and expanded to emerge at super- early failures. { a¯jiŋ } agitating speed sonic speeds. { er a¨rk fərnəs } [MECH ENG] The rate of rotaair aspirator valve [MECH ENG] On certain au- tion of the drum or blades of a truck mixer or other device used for agitation of mixed con- tomotive engines, a one-way valve installed on crete. { ajəta¯diŋ spe¯d } the exhaust manifold to allow air to enter the agitating truck [MECH ENG] A vehicle carrying exhaust system; provides extra oxygen to convert a drum or agitator body, in which freshly mixed carbon monoxide to carbon dioxide. Also concrete can be conveyed from the point of mix- known as gulp valve. { er aspəra¯dər valv } ing to that of placing, the drum being rotated air-assist forming [ENG] A plastics thermocontinuously to agitate the contents. { aj forming method in which air pressure is used to əta¯diŋ trək } partially preform a sheet before it enters the agitator [MECH ENG] A device for keeping liq- mold. { er əsist fo˙rmiŋ } uids and solids in liquids in motion by mixing, air-atomizing oil burner [ENG] An oil burner in stirring, or shaking. { ajəta¯dər } which a stream of fuel oil is broken into very fine agitator body [MECH ENG] A truck-mounted droplets through the action of compressed air. drum for transporting freshly mixed concrete; { er atəmı¯ziŋ o˙ il bərnər } rotation of internal paddles or of the drum pre- air bag [MECH ENG] An automotive vehicle pasvents the setting of the mixture prior to delivery. senger safety device consisting of a passive re- { ajəta¯dər ba¨de¯ } straint in the form of a bag which is automatically 12
air conditioner flated with gas to provide cushioned pr A device used in thermal oses of atomization. f'er ka air belt MECH ENGI The chamber which equal- air casing JENG pressure that is blasted into the cupola :h回 passage of the lq airblasting ENGI A blasting technique in which a shot hole and discharged. Also known as SV5- as with lision. I'er, bom ki>e danger of possible air change lENGI A measure of ecified time period; usually ex os叶hAF以t中 the air or surface abed articles by size through the action of a stream air. Also known as air elutriator. [ ''klas orn i. 'tran ik ' sarva kan'tra fi- ar 1 GI Any of various devices de used to track and lock on"to another aircraft d or followed. 'er, born in apes are screens, settling chambers. filters, wet collectors, and electro- airborne magnetometer ENG An airborne static precipitators. I'er klen-or I tre the ma of mercaptans from gasoline by caustic an ectronic npregnated with copper chloride; the oxygen breviated app the catalyst. ' er, ko 'huv-ar rd- I swet-nin airborne radar ENGI Radar equipment carried air compressor cating other lected system resistance on the discharge side. aircraft either for avoidance or attack. ('er ['er, kam'pr air-compressor unloader MECH ENG) A device airborne waste ENG Vapors, gases, or particu- rough an air kamp ontrolling the flow into or out of the cylinder denser. 2.a device that removes va namic vehicle, required to take in air for the reduces the humidity of air in build- purpose of combustion. ' er breth in I gs.'er kan'dish-an-ar
air conditioner inflated with gas to provide cushioned protec- air cap [MECH ENG] A device used in thermal tion against the impact of a collision. { er spraying which directs the air pattern for pur- bag } poses of atomization. { er kap } air belt [MECH ENG] The chamber which equal- air casing [ENG] A metal casing surrounding a izes the pressure that is blasted into the cupola pipe or reservoir and having a space between to at the tuyeres. { er belt } prevent heat transmission. { er ka¯siŋ } air bind [ENG] The presence of air in a conduit air cell [ELECTR] A cell in which depolarization or pump which impedes passage of the liquid. at the positive electrode is accomplished chemi- { er bı¯nd } cally by reduction of the oxygen in the air. airblasting [ENG] A blasting technique in which [MECH ENG] A small auxiliary combustion air at very high pressure is piped to a steel shell chamber used to promote turbulence and im- in a shot hole and discharged. Also known as prove combustion in certain types of diesel en- air breaking. { erblastiŋ } gines. { er sel } air bleeder [MECH ENG] A device, such as a nee- air chamber [MECH ENG] A pressure vessel, dle valve, for removing air from a hydraulic sys- partially filled with air, for converting pulsating tem. { er ble¯dər } flow to steady flow of water in a pipeline, as with airborne collision warning system [ENG] A sys- a reciprocating pump. { er cha¯mbər } tem such as a radar set or radio receiver carried air change [ENG] A measure of the movement by an aircraft to warn of the danger of possible of a given volume of air in or out of a building collision. { erbo˙rn kəlizhən wo˙rniŋ sis or room in a specified time period; usually ex- təm } pressed in cubic feet per minute. { er cha¯nj } airborne detector [ENG] A device, transported air check [ENG ACOUS] A recording made of a by an aircraft, whose function is to locate or live radio broadcast for filing purposes at the identify an air or surface object. { erbo˙rn di broadcasting facility. { er chek } tektər } air classifier [MECH ENG] A device to separate airborne electronic survey control [ENG] The particles by size through the action of a stream airborne portion of very accurate positioning sys- of air. Also known as air elutriator. { er klas tems used in controlling surveys from aircraft. əfı¯ər } { erbo˙rn ilektra¨nik sərva¯ kəntro¯ l } air cleaner [ENG] Any of various devices de- airborne intercept radar [ENG] Airborne radar signed to remove particles and aerosols of spe- used to track and ‘‘lock on’’ to another aircraft cific sizes from air; examples are screens, settling to be intercepted or followed. { erbo˙rn in chambers, filters, wet collectors, and electro- tərsept ra¯da¨r } static precipitators. { er kle¯nər } airborne magnetometer [ENG] An airborne in- Airco-Hoover sweetening [CHEM ENG] Remo- strument used to measure the magnetic field of val of mercaptans from gasoline by caustic and the earth. { erbo˙rn magnəta¨mədər } water washes, then heating the dried gasoline airborne profile recorder [ENG] An electronic and passing it with some oxygen through a reac- instrument that emits a pulsed-type radar signal tor containing a slurry of diatomaceous earth from an aircraft to measure vertical distances impregnated with copper chloride; the oxygen between the aircraft and the earth’s surface. regenerates the catalyst. { erko¯ hu¨ vər Abbreviated APR. Also known as terrain profile swe¯tniŋ } recorder (TPR). { erbo˙rn pro¯ fı¯l riko˙rdər } air compressor [MECH ENG] A machine that in- airborne radar [ENG] Radar equipment carried creases the pressure of air by increasing its den- by aircraft to assist in navigation by pilotage, to sity and delivering the fluid against the con- determine drift, and to locate weather distur- nected system resistance on the discharge side. bances; a very important use is locating other { er kəmpresər } aircraft either for avoidance or attack. { er air-compressor unloader [MECH ENG] A device bo˙rn ra¯da¨r } for control of air volume flowing through an air airborne waste [ENG] Vapors, gases, or particu- compressor. { er kəmpresər ənlo¯ dər } lates introduced into the atmosphere by evapo- air-compressor valve [MECH ENG] A device for ration, chemical, or combustion processes; a fre- controlling the flow into or out of the cylinder quent cause of smog and an irritant to eyes and of a compressor. { er kəmpresər valv } breathing passages. { erbo˙rn wa¯st } air condenser [MECH ENG] 1. A steam con- air-bound [ENG] Of a pipe or apparatus, con- denser in which the heat exchange occurs taining a pocket of air that prevents or reduces the desired liquid flow. { er bau˙ nd } through metal walls separating the steam from air brake cooling air. Also known as air-cooled con- [MECH ENG] An energy-conversion mechanism activated by air pressure and used denser. 2. A device that removes vapors, such to retard, stop, or hold a vehicle or, generally, as of oil or water, from the airstream in a comany moving element. { er bra¯ k } pressed-air line. { er kəndensər } air breaking See airblasting. { er bra¯ kiŋ } air conditioner [MECH ENG] A mechanism priair-breathing [MECH ENG] Of an engine or aero- marily for comfort cooling that lowers the temdynamic vehicle, required to take in air for the perature and reduces the humidity of air in buildpurpose of combustion. { er bre¯thiŋ } ings. { er kəndishənər } 13
air conditioning air conditioning MECH ENGI The maintenance eflecting vanes discharging supply air in various defined space to facilitate the function of that clude air tempera- 0a6“ Ith the air already nown as di neumatic conveyor. 'er IMECH ENGI An engine air diving IENGI interposition of a liquid medium. I'er kuld pheric mixture of oxygen and nitrogen: limite CH ENGI A air drain IcIv ENGI An empty space left arou nB prevent the earth from lying against it and caus- induced draft) across the tube bank. ould et iks'chani-ar and hydraulic action for operation, 4, er'drol cooling MECH ENG Lowering of air temper- ik I ature for comfort, process control, or food preser- air drill MECH ENG A drill powered by com- noving moisture from a the extent that very of the presence of aircraft; major tech- furthe e is release ure. i er'drTin I An instrument carried air ejector [MECH ENG A device that uses of airborne particles. I'er, kraft im pak afte I'jek-tor I air-cure ICHEM ENGI To vulcanize at ordinary a device used to remove air from water, steam peratures, or without the aid of heat. air elutriator See air classifier ing flu heat across it, and permits air-condition f a space wit NG A mechanical de oped air to arrest motion without shock. giving improved properties for the end product. air-cushion vehicle MECH ENG A =二 fitte ielfel mac i ne edEM: hover. airexhaust vent ia oq idMECh ENGipa vea.kal chaust unit used to carry away dirt particles. akeoff and landing of airplanes. I 'er, feld air cycle MECH ENGI A refrigeration cycle char- air filter ENGI A device that reduces the co operated in a process or space air flotation See dissolved air flotation. I air density MECH The mass per unit volume lly located i An air distribution outlet. closed space. Also known as air duct.'er ceiling and consisting of 14
air conditioning air conditioning [MECH ENG] The maintenance deflecting vanes discharging supply air in various of certain aspects of the environment within a directions and planes, and arranged to promote defined space to facilitate the function of that mixing of the supplied air with the air already space; aspects controlled include air tempera- in the room. { er difyu¨zər } ture and motion, radiant heat level, moisture, air-distributing acoustical ceiling [BUILD] A and concentration of pollutants such as dust, suspended acoustical ceiling in which the board microorganisms, and gases. Also known as cli- or tile is provided with small, evenly distributed mate control. { er kəndishəniŋ } mechanical perforations; designed to provide a air conveyor See pneumatic conveyor. { er desired flow of air from a pressurized plenum kənva¯ər } above. { er distribyədiŋ əku¨stikəl se¯liŋ } air-cooled engine [MECH ENG] An engine air diving [ENG] A type of diving in which the cooled directly by a stream of air without the diver’s breathing medium is a normal atmosinterposition of a liquid medium. { er ku¨ ld pheric mixture of oxygen and nitrogen; limited enjən } to depths of 190 feet (58 meters). { er dı¯viŋ } air-cooled heat exchanger [MECH ENG] A air drain [CIV ENG] An empty space left around finned-tube (extended-surface) heat exchanger the external foundation wall of a building to with hot fluids inside the tubes, and cooling prevent the earth from lying against it and causair that is fan-blown (forced draft) or fan-pulled ing dampness. { er dra¯n } (induced draft) across the tube bank. { er ku¨ ld airdraulic [MECH ENG] Combining pneumatic he¯t ikscha¯njər } and hydraulic action for operation. { erdro˙ l air cooling [MECH ENG] Lowering of air temper- ik } ature for comfort, process control, or food preser- air drill [MECH ENG] A drill powered by comvation. { er ku¨ liŋ } pressed air. { ¦er dril } air course See airway. { er ko˙rs } air drying [ENG] Removing moisture from a maaircraft detection [ENG] The sensing and dis- terial by exposure to air to the extent that no covery of the presence of aircraft; major tech- further moisture is released on contact with air; niques include radar, acoustical, and optical important in lumber manufacture. { ¦er drı¯iŋ } methods. { erkraft ditekshən } air duct See airflow duct. { ¦er dəkt } aircraft impactor [ENG] An instrument carried air ejector [MECH ENG] A device that uses a by an aircraft for the purpose of obtaining sam- fluid jet to remove air or other gases, as from a ples of airborne particles. { erkraft impak steam condenser. { ¦er ijektər } tər } air eliminator [MECH ENG] In a piping system, air-cure [CHEM ENG] To vulcanize at ordinary a device used to remove air from water, steam, room temperatures, or without the aid of heat. or refrigerant. { ¦er iliməna¯dər } { er kyu¨r } air elutriator See air classifier. { ¦er e¯lu¨tre¯a¯dər } air curtain [MECH ENG] A stream of high-veloc- air engine [MECH ENG] An engine in which ity temperature-controlled air which is directed compressed air is the actuating fluid. { ¦er downward across an opening; it excludes insects, enjən } exterior drafts, and so forth, prevents the transfer air entrainment [ENG] The inclusion of minute of heat across it, and permits air-conditioning bubbles of air in cement or concrete through the of a space with an open entrance. { er kərtən } addition of some material during grinding or air cushion [MECH ENG] A mechanical device mixing to reduce the surface tension of the water, using trapped air to arrest motion without shock. giving improved properties for the end product. { er ku˙ shən } { ¦er intra¯nmənt } air-cushion vehicle [MECH ENG] A transporta- air escape [DES ENG] A device that is fitted to tion device supported by low-pressure, low- a pipe carrying a liquid for releasing excess air; velocity air capable of traveling equally well over it contains a valve that controls air release while water, ice, marsh, or relatively level land. Also preventing loss of liquid. { er əska¯p } known as ground-effect machine (GEM); hover- air-exhaust ventilator [MECH ENG] Any aircraft. { er ku˙ shən ve¯əkəl } exhaust unit used to carry away dirt particles, air-cut [ENG] Referring to the inadvertent me- odors, or fumes. { er igzo˙ st ventəla¯dər } chanical incorporation of air into a liquid system. airfield [CIV ENG] The area of an airport for the { er kət } takeoff and landing of airplanes. { erfe¯ld } air cycle [MECH ENG] A refrigeration cycle char- air filter [ENG] A device that reduces the conacterized by the working fluid, air, remaining as centration of solid particles in an airstream to a a gas throughout the cycle rather than being level that can be tolerated in a process or space condensed to a liquid; used primarily in airplane occupancy; a component of most systems in air conditioning. { er sı¯kəl } which air is used for industrial processes, ventilaair cylinder [MECH ENG] A cylinder in which air tion, or comfort air conditioning. { er filtər } is compressed by a piston, compressed air is air flotation See dissolved air flotation. { er stored, or air drives a piston. { er siləndər } flo¯ ta¯shən } air density [MECH] The mass per unit volume airflow duct [ENG] A pipe, tube, or channel of air. { er densəde¯ } through which air moves into or out of an enair diffuser [BUILD] An air distribution outlet, closed space. Also known as air duct. { er usually located in the ceiling and consisting of flo¯ dəkt } 14