Electrograph

Or deflagration of an explosive. i.lek-troT-ik 'splo-siv electrograph eng Any plot, graph, or tracing produced by the action of an electric current on prepared sensitized paper (or other chart material) or by means of an electrically controlled stylus or pen. i'lek-trs.graf electrohydraulic eng Operated or effected by a combination of electric and hydraulic mechanisms. i ek-tro-hT'drool-ik electrokinetograph eng An instrument used to measure ocean current velocities based on their electrical...

Bump contact

Number used in the study of heat transfer during evaporation. 'bul-s-jsn .nsm-bsr bump contact electr A large-area contact used for alloying directly to the substrate of a transistor for mounting or interconnecting purposes. 'bsmp .kan.takt bumper eng 1. A metal bar attached to one or both ends of a powered transportation vehicle, especially an automobile, to prevent damage to the body. 2. In a drilling operation, the supporting stay between the main foundation sill and the engine block. 3. In...

Steam turbine

Steam dryer mech eng A device for separating liquid from vapor in a steam supply system. 'steim .driT-ar steam emulsion test eng A test used for measuring the ability of oil and water to separate, especially for steam-turbine oil after emulsifica-tion and separation, the time required for the emulsion to be reduced to 3 milliliters or less is recorded at 5-minute intervals. 'stem i'mal-shan .test steam engine mech eng A thermodynamic device for the conversion of heat in steam into work,...

Air conditioning

Air conditioning mech eng The maintenance of certain aspects of the environment within a defined space to facilitate the function of that space aspects controlled include air temperature and motion, radiant heat level, moisture, and concentration of pollutants such as dust, microorganisms, and gases. Also known as climate control. 'er ,ksn'dish-sn-ig air conveyor See pneumatic conveyor. 'er ksn,va-sr air-cooled engine mech eng An engine cooled directly by a stream of air without the...

Concrete cart

Concrete cart See concrete buggy. 'kag.kret concrete chute eng A long metal trough with rounded bottom and open ends used for conveying concrete to a lower elevation. 'kag .kret .shut concrete column civeng A vertical structural member made of reinforced or unreinforced concrete. 'kag.kret 'kal-sm concrete dam civ eng A dam that is built of concrete. 'kag.kret 'dam concrete mixer mech eng A machine with a rotating drum in which the components of concrete are mixed. 'kag.kret .mik-ssr concrete...

Reactance drop

Is proportional to the integral of the angular rate of the base about the input axis. 'riat int-s,gr d-ig ,jT-rs,skop rate of change of acceleration (mech Time rate of change of acceleration this rate is a factor in the design of some items of ammunition that undergo large accelerations. 'r t sv 'chanj sv ik,sel-s'r -shsn rate-of-flow control valve See flow control valve. 'r t sv 'flo ksn trol ,valv rate-of-rainfall gage See rain-intensity gage. 'r t sv 'r nfol ,g j rate of rise (eng The time...

Jerk pump

A unit of rate of change of acceleration, equal to 1 foot (30.48 centimeters) per second squared per second. jsrk jerk pump mech eng A pump that supplies a precise amount of fuel to the fuel injection valve of an internal combustion engine at the time the valve opens used for fuel injection. 'jsrk .psmp jet bit des eng A modification of a drag bit or a roller bit that utilizes the hydraulic jet principle to increase drilling rate. 'jet bit jet compressor mech eng A device,...

Sparkcoil leak detector

Through radio and optical means. 'spaTs.kraft .trak-ig space detection and tracking system eng System capable of detecting and tracking space vehicles from the earth, and reporting the orbital characteristics of these vehicles to a central control facility. Abbreviated SPADATS. 'spSs di ek-shsn sn trak-ig .sis-tsm spaced loading eng Loading shot holes so that cartridges are separated by open spacers which do not prevent the concussion from one charge from reaching the next. 'spSst 'lod-ig space...

Spring gravimeter

Form until a shell of predetermined thickness is achieved the shell is then removed and backed up with plaster, cement, or casting resin used primarily in plastic sheet forming. 'spraTd med-sl mold sprayer plate eng A rotating flat-faced or dished metal plate used in an oil burner to enhance atomization. 'spra-sr plat spray gun mech eng An apparatus shaped like a gun which delivers an atomized mist of liquid. 'spra gsn spray nozzle mech eng A device in which a liquid is subdivided to form a...

Blackbody temperature

Blackbody temperature thermo The temperature of a blackbody that emits the same amount of heat radiation per unit area as a given object measured by a total radiation pyrometer. Also known as brightness temperature. 'blakjbad-e .tem-prs-chsr black box eng Any component, usually electronic and having known input and output, that can be readily inserted into or removed from a specific place in a larger system without knowledge of the component's detailed internal structure. 'blak .baks black-bulb...

Weight barometer

By extension, the gravitational force with which a star, planet, or satellite attracts a nearby body. wilt weight barometer eng A mercury barometer which measures atmospheric pressure by weighing the mercury in the column or the cistern. 'wilt ba.rSm-ad-ar weighting eng The artificial adjustment of measurements to account for factors that, in the normal use of the device, would otherwise be different from conditions during the measurements. 'waid-ig weighting...

Dry sieving

Dry abrasive cutting mech eng Frictionalcut-ting using a rotary abrasive wheel without the use of a liquid coolant. drT s.bra-siv 'ksd-ig dry-back boiler See scotch boiler. drT .bak 'bouil-sr dry bed chem eng A configuration of solid adsorption materials, for example molecular sieves or charcoal, used to recover liquid from or purify a gas stream. 'drT 'bed dry blast cleaning eng Cleaning of metallic surfaces by blasting with abrasive material traveling at a high velocity abrasive may be...

Porcupine boiler

Sections or lengths to oppose one another. poling board civ eng A timber plank driven into soft soil to support the sides of an excavation. 'pol-ig .bord polishing chem eng In petroleum refining, removal of final traces of impurities, as for a lubricant, by clay adsorption or mild hydrogen treating. mech eng Smoothing and brightening a surface such as a metal or a rock through the use of abrasive materials. 'pSl-ish-ig polishing roll mech eng A roll or series of rolls on a plastics mold has...

Finite element method

Provides a site for a septic field. eng Acon-tact bed used for filtering purposes. 'fil-tar . bed filter cake See mud cake. 'fil-tar .kak filter-cake washing chem eng An operation performed at the end of a filtration, in which residual liquid impurities are washed out of the cake by the flow of another liquid through the cake. 'fil-tar .kak .wash-ig filter capacitor elec A capacitor used in a power-supply filter system to provide a low-reactance path for alternating currents and thereby...

Rotary furnace

Diagram, named after its designer, with mixing ratio as abscissa and potential temperature as ordinate lines of constant equivalent potential temperature are added. 'ros-be dT-s gram Rossfeeder mecheng A chute for conveying bulk materials by means of a screen of heavy endless chains hung on a sprocket shaft rotation of the shaft causes materials to slide. 'ros 'fed-sr Rossman drive eng A method used to provide speed control of alternating-current motors an induction motor stator is mounted on...

Interaction balance method

Interaction balance method See goal coordination method. in-tafak-shan 'bal-ans .meth-ad interaction prediction method cont sys A method for coordinating the subproblem solutions in plant decomposition, in which the interaction variables are specified by the second-level controller according to overall optimality conditions, and the subproblems are solved to satisfy local optimality conditions constrained by the specified values of the interaction variables. Also known as feasible method. in-ta...

Compression coupling

That weak signal components will not be lost in background and strong signals will not overload the system. 2. See compression ratio. mech Reduction in the volume of a substance due to pressure for example in building, the type of stress which causes shortening of the fibers of a wooden member. mech eng See compression ratio. kam'presh-an compression coupling mech eng 1. A means of connecting two perfectly aligned shafts in which a slotted tapered sleeve is placed over the junction and two...

Explosion rupture disk device

Expanding brake (mech eng A brake that operates by moving outward against the inside rim of a drum or wheel. ik'spand-ig 'brak expansion (electr A process in which the effective gain of an amplifier is varied as a function of signal magnitude, the effective gain being greater for large signals than for small signals the result is greater volume range in an audio amplifier and greater contrast range in facsimile. (mech eng Increase in volume of working material with accompanying drop in pressure...

Rolling contact

Rodding eng An operation in which a rod is passed through a length of tubing such as a rifle or pipework to determine if the bore is clear. 'rSd-ig rod level eng A spirit level attached to a level rod or stadia rod to ensure the vertical position of the rod prior to instrument reading. 'rSd .lev-al rod mill mech eng A pulverizer operated by the impact of heavy metal rods. 'rSd .mil rod string mech eng Drill rods coupled to form the connecting link between the core barrel and bit in the borehole...

Robins Messiter system

Robins-Messiter system mech eng A stacking conveyor system in which material arrives on a conveyor belt and is fed to one or two wing conveyors. 'rab-snz 'mes-s-tsr .sis-tsm Robitzsch actinograph eng A pyranometer whose design utilizes three bimetallic strips which are exposed horizontally at the center of a hemispherical glass bowl the outer strips are white reflectors, and the center strip is a blackened absorber the bimetals are joined in such a manner that the pen of the instrument deflects...

Electrical blasting cap

Electrical blasting cap eng A blasting cap ignited by electric current and not by a spark. a'lek-tra-kal 'blast-ig ,kap electrical breakdown See breakdown. a'lek-tra- kal 'br akldaUn electrical conductance See conductance. a'lek- tra-kal kan'dak-tans electrical conduction See conduction. a'lek-tra- kal kan'dak-shan electrical conductivity See conductivity. a'lek- tra-kal kan dak'tiv-ad-e electrical drainage elec Diversion of electric currents from subterranean pipes to prevent electrolytic...

Settler

Settler eng A separator, such as a tub, pan, vat, or tank in which the partial separation of a mixture is made by density difference used to separate solids from liquid or gas, immiscible liquid from liquid, or liquid from gas. 'set-lar settling eng The gravity separation of heavy from light materials for example, the settling out of dense solids or heavy liquid droplets from a liquid carrier, or the settling out of heavy solid grains from a mixture of solid grains of different densities....

Ballfloat liquidlevel meter

Balance method See null method. 'bal-sns .meth-sd balance pipe eng A pipe in a compressed-air piping system that is used to displace trapped air so that the condensate can flow freely into the trap. 'bal-sns .pTpe balance tool mech eng A tool designed for taking the first cuts when the external surface of a piece in a lathe is being machined it is supported in the tool holder at an unvarying angle. 'bal-sns .tul balance wheel mech eng 1. A wheel which governs or stabilizes the movement of a...

Thrust load

Sustains axial loads and prevents axial movement of a loaded shaft. 'thrsst .ber-ig thrust load mech eng A load or pressure parallel to or in the direction of the shaft of a vehicle. 'thrsst .lod thrust meter eng An instrument for measuring static thrust, especially of a jet engine or rocket. 'thrsst .med-sr thrust yoke mech eng The part connecting the piston rods of the feed mechanism on a hydraulically driven diamond-drill swivel head to the thrust block, which forms the connecting link...

Scotch yoke

Path in a 746-kilowatt furnace. 'shan-her 'hes.barg-ar .prS-sas Schoop process eng A process for coating surfaces by spraying with high-velocity molten metal particles. shop .prS-sas Schottky barrier electr A transition region formed within a semiconductor surface to serve as a rectifying barrier at a junction with a layer of metal. 'shSt-ke .bar-e-ar Schottky barrier diode electr A semiconductor diode formed by contact between a semiconductor layer and a metal coating it has a nonlinear...

Mechanical vibration

Mechanical vibration mech The continuing motion, often repetitive and periodic, of parts of machines and structures. mi'kan-s-ksl vl'bra-shsn mechanism mecheng That part of a machine which contains two or more pieces so arranged that the motion of one compels the motion of the others. 'mek-s.niz-sm mechanize mech eng 1. To substitute machinery for human or animal labor. 2. To produce or reproduce by machine. 'mek-s.nTz mechanized dew-point meter See dew-point recorder. 'mek-s.nizd 'dU .point...

Frequencyresponse curve

Almost inertial masses and a laser interferometer that detects their motions. .frei .mas an'ten-s free-piston engine mech eng A prime mover utilizing free-piston motion controlled by gas pressure in the cylinders. 'frei .pis-tsn 'en-jsn free-piston gage eng An instrument for measuring high fluid pressures in which the pressure is applied to the face of a small piston that can move in a cylinder and the force needed to keep the piston stationary is determined. Also known as piston gage. frei...

Choptype feeder

Carries the masonry above the fireplace opening. Also known as turning bar. 'chim.ne .bar chimney cap civeng A rotary device fitted to a chimney and moved by the wind so that the chimney is turned away from the wind to permit the escape of smoke while rain or snow is prevented from entering the chimney. 'chim-neT . kap chimney core mecheng The inner section of a double-walled chimney which is separated from the outer section by an air space. 'chim.ne .kor chip electr 1. The shaped and processed...

Viscometer gage

When a soft-iron slug at its tip is attracted to the pole piece of a driving coil. mech eng An instrument which produces mechanical oscillations. 'vT.brSd-sr vibratory centrifuge mech eng A high-speed rotating device to remove moisture from pulverized coal or other solids. 'vT-brs.tUr-e 'sen-trs.fyUj vibratory equipment mech eng Reciprocating or oscillating devices which move, shake, dump, compact, settle, tamp, pack, screen, or feed solids or slurries in process. 'vT-brs.tor-e i'kwip-msnt...

Boundary friction

Donor and acceptor concentrations are equal. 'baun-dre boundary friction mech Friction between surfaces that are neither completely dry nor completely separated by a lubricant. 'baun-dre .frik-shsn boundary lubrication eng A lubricating condition that is a combination of solid-to-solid surface contact and liquid-film shear. 'baun-dre .lu-brs'ka-shsn boundary monument eng A material object placed on or near a boundary line to preserve and identify the location of the boundary line on the ground....

Simultaneous motioncycle chart

Fixed relative to the observer. .sT-msl-ts'ne-sd-e simultaneous motion-cycle chart See simo chart. .sT-msl'tS-nee-ss 'moo-shsn sT-ksl .chart sine bar des eng A device consisting of a steel straight edge with two cylinders of equal diameter attached near the ends with their centers equidistant from the straightedge used to measure angles accurately and to lay out work at a desired angle in relationship to a surface. 'sTn .bar sine galvanometer eng A type of magnetometer in which a small magnet...

Soundlevel meter

The distance between the instrument and a sound-reflecting surface used to measure the size of cavities around brine wells, and capacities of underground liquefied petroleum gas storage chambers. 'san-ik 'wel ,lag-ig sonobuoy eng An acoustic receiver and radio transmitter mounted in a buoy that can be dropped from an aircraft by parachute to pick up underwater sounds of a submarine and transmit them to the aircraft to track a submarine, several buoys are dropped in a pattern that includes the...

Thinfilm integrated circuit

Thermophone eng acous An electroacoustic transducer in which sound waves having an accurately known strength are produced by the expansion and contraction of the air adjacent to a strip of conducting material, whose temperature varies in response to a current input that is the sum of a steady current and a sinusoidal current used chiefly for calibrating microphones. 'thar-ma.fon thermophoresis thermo The movement of particles in a thermal gradient from high to low temperatures....

Air lock

Airflow orifice eng An opening through which air moves out of an enclosed space. 'er.floT 'or-s-fss airflow pipe eng A tube through which air is conveyed from one location to another. 'er .flo .pTp air-fuel mixture mech eng In a carbureted gasoline engine, the charge of air and fuel that is mixed in the appropriate ratio in the carburetor and subsequently fed into the combustion chamber. 'er 'fytil .miks-chsr air gage eng 1. A device that measures air pressure. 2. A device that compares the...

Centrifuge

Centrifugal brake mech eng A safety device on a hoist drum that applies the brake if the drum speed is greater than a set limit. .sen'trif-i-gsl 'brak centrifugal casting eng A method for casting metals or forming thermoplastic resins in which the molten material solidifies in and conforms to the shape of the inner surface of a heated, rapidly rotating container. .sen'trif-i-gsl 'kast-ig centrifugal clarification mech eng The removal of solids from a liquid by centrifugal action which decreases...

Blackbody radiation

By the thermal diffusivity equals the Laplacian of the temperature. by fur-ya i'kwa-zhsn biotron eng A test chamber used for biological research within which the environmental conditions can be completely controlled, thus allowing observations of the effect of variations in environment on living organisms. 'bT-s.tran bipolar amplifier electr An amplifier capable of supplying a pair of output signals corresponding to the positive or negative polarity of the input signal. bT'po-lsr 'am-pls.fT-sr...

Cantilever

Of propellants and explosives properties normally determined are heat of combustion, heat of explosion, heat of formation, and heat of reaction. ks or-sme-trik 'test calorimetry eng The measurement of the quantity of heat involved in various processes, such as chemical reactions, changes of state, and formations of solutions, or in the determination of the heat capacities of substances fundamental unit of measurement is the joule or the calorie (4.184 joules). kal-s'rim-s-tre calyx eng A steel...

Wiese formula

Wieseformula eng An empirical relationship for motor fuel antiknock values above 100 in relation to performance numbers basis for the American Society forTesting and Materials scale, in which octane numbers above 100 are related to increments of tetraethyllead added to isooctane. 've-zs .for-mys-ls Wildfence eng A wooden enclosure about 16 feet (4.8 meters) square and 8 feet (2.4 meters) high with a precipitation gage in its center the function of the fence is to minimize eddies around the...

Sequential logic element

Determine the instantaneous position of a vehicle in flight. si'kwen-chsl ks'la-shsn sv 'raanj sequential logic element electr A circuit element having at least one input channel, at least one output channel, and at least one internal state variable, so designed and constructed that the output signals depend on the past and present states of the inputs. si'kwen-chsl laj-ik ,el-s-msnt sequential sampling ind eng A sampling plan in which an undetermined number of samples are tested one by one,...

Mean temperature difference

The maximum and minimum values of a periodically varying stress. 2. See octahedral normal stress. 'men 'stres mean temperature difference chem eng In heat exchange calculations, a pseudo average temperature difference between the warmer and colder fluids at inlet and outlet conditions. 'men 'tem-pra-char .dif-rans mean time to failure eng A measure of reliability of a piece of equipment, giving the average time before the first failure. 'men 'tim ta 'fal-yar mean time to repair eng A measure of...

Directional control

Being the usual plane of the latter usually indicated in terms of its angular distance from a reference direction. ds'rek-shsn directional control eng Control of motion about the vertical axis in an aircraft, usually by the rudder. ds'rek-shsn-sl ksn'trol directional control valve eng A control valve serving primarily to direct hydraulic fluid to the point of application. ds'rek-shsn-sl ksn'trol .valv directional drilling eng A drilling method involving intentional deviation of a wellbore from...

Surfacing mat

Surfacing mat See overlay. 'sar-fa-sig .mat surge elec A momentary large increase in the current or voltage in an electric circuit. eng 1. An upheaval of fluid in a processing system, frequently causing a carryover (puking) of liquid through the vapor lines. 2. The peak system pressure. 3. An unstable pressure buildup in a plastic extruder leading to variable throughput and waviness of the hollow plastic tube. sarj surge arrester elec A protective device designed primarily for connection...

Lightactivated silicon controlled switch

Current in providing switching action. Abbreviated LASCR. Also known as photo-SCR photothyristor. 'lTt ak-ts.vad-sd sil-s-ksn ksn tr5ld 'rek-ts.fT-sr light-activated silicon controlled switch electr A semiconductor device that has four layers of silicon alternately doped with acceptor and donor impurities, but with all four of the p and n layers made accessible by terminals when a light beam hits the active light-sensitive surface, the photons generate electron-hole pairs that make the device...

Lightactivated silicon controlled rectifier

Lever which travels through a maximum arc of 180 . 'lev-sl ,valv Levenstein process chem eng A process for the manufacture of mustard gas from ethene, CH2 CH2, and sulfur chloride, S2Ch. 'le-vsn,stTn ,pra-sss lever eng A rigid bar, pivoted about a fixed point (fulcrum), used to multiply force or motion used for raising, prying, or dislodging an object. 'lev-sr, lee-vsr leverage mech The multiplication of force or motion achieved by a lever. 'lev-rij lever shears des eng A shears in which the...

Heterodyne frequency meter

Measure of its amount by action of sun's rays on blueprint paper. 'hi-li-s.graf heliostat eng A clock-driven instrument mounting which automatically and continuously points in the direction of the sun it is used with a pyrheliometer when continuous direct solar radiation measurements are required. 'hi-lei -s. stat heliotrope eng An instrument that reflects the sun's rays over long distances used in geodetic surveys. 'hi-li-s.trop helipad civ eng The launch and landing area of a heliport. Also...

Disk leather wheel

Is released to the outside of the device. 'dis .charj .chan-sl discharged solids See residue. dis.charjd 'sal-sdz discharge head mech eng Vertical distance between the intake level of a water pump and the level at which it discharges water freely to the atmosphere. 'dis.charj .hed dischargehydrograph civeng Agraphshow-ing the discharge or flow of a stream or conduit with respect to time. 'dis.charj 'hl-drs.graf discharge line eng The length of pipe through which drilling mud travels from the...

Concrete caisson sinking

A rail that has different joint drillings from that of the same section. 'kam-pra,mTz joint compromise rail civ eng A short rail having different sections at the ends to correspond with the rail ends to be joined, thus providing a transition between rails of different sections. 'kam-pra,mTz ,ral computational numerical control See computer numerical control. ,kam-pya'ta-shan-al nu 'mer-a-kal kan'trol computed path control cont sys A control system designed to follow a path calculated to be the...

Veneered construction

Flow actuates the movement of a wheel or turbine-type impeller, giving a volume-time reading. Also known as current meter rotating meter. vs'las-sd-i tTp 'flo.mid-sr veneered construction build A type of construction in which the framework is faced with a thin external layer of material, such as marble. vs nird ksn'strsk-shsn vent eng 1. A small passage made with a needle through stemming, for admitting a squib to enable the charge to be lighted. 2. A hole, extending up through the bearing at...

Thermal soakback

A sudden change in temperature. 'thsr-msl 'shak thermal soakback eng A phenomenon whereby, due to the lag in propagation of temperature changes through insulating materials, the maximum temperature of a thermally protected structure may be reached a certain time after the protective coating has reached its maximum temperature. thsr-msl 'soTk bak thermal stress mech Mechanical stress induced in a body when some or all of its parts are not free to expand or contract in response to changes in...

Doubleacting

Double-acting mecheng Acting in two directions, as with a reciprocating piston in a cylinder with a working chamber at each end. dsb-sl 'ak-tig double-acting compressor mech eng A reciprocating compressor in which both ends of the piston act in working chambers to compress the fluid. dsb-sl ak-tig ksm'pres-sr double-acting pawl mech eng Adouble pawl which can drive in either direction. dsb-sl ak- double-action mechanical press mech eng A press having two slides which move one within the other...

Flesh Demag process

With joints broken to give a variety of patterns. flem-ish 'gard-sn wol .band Flesh-Demag process chemeng Agas-mak-ing process in which a cyclic water-gas apparatus is used for feeding and charring the coal charge and for gas generation, with periodic automatic removal of the resultant ash. flesh 'da-mak .pras-ss fleshing machine eng A machine that removes flesh from hides in a tannery. 'flesh-ig ms.shen Fletcher radial burner eng A burner with gas jets arranged radially. 'flech-sr rUd-TT-sl...