Centering control. (Tel.) A control on the receiver for centering the picture either vertically or horizontally.
Centering work. (Mech.) The process of locating the exact center of a piece of material foturnin on the lathe. A harmaphrodite caliper or a combination on square with a center head and ascriber may be used to center cylindrical pieces.
Centerless grinding. (Mach.) Accomplished by a machine with a high-speed grinding wheel opposite which is a regulating wheel moving slowly in reverse direction. A rest forms a support for the work in the throat between the two wheels.
Center line. (Draft.) A broken line usually dot and dash indicating the center-of the object and a very con
venient line from which to layoff measurements.
Center of buoyancy. (Aero.) In a seaplane, the center of gravity of the fluid displaced.
Center of gravity. That point about which a body will be balanced when placed in any position.
Center-of-pressure coefficient. (Aero.) The ratio of the distance of the center of pressure from the leading edge to the chord length.
Center of pressure of an airfoil section. (Aero.) The point in the chord of an airfoil section pro longed if necessary, which is at the intersection of the chord and the line of action of the resultant air force.
Center-piece. (Arch.) Ornament placed in the center of a ceiling.
Center punch. (Metalwk.) A steel punch with one end ground to a point; used for laying out work.
Center reamer. (Shopwk.) Center reamers, or countersinks, for centering the ends of shafts, etc., are usually at a 60 deg. included angle. Combined center drill and reamer are now universally used.
Center rest. (Mach.) A support for lathe work which clamps onto the inside ways of the lathe bed. Used when turning long shafts, boring spindles, etc.
Centers. (Mach.) Those pieces carried in the headstock and the tailstock of a lathe having cone-shaped points between which work is supported.
Center section. (Aero.) The center panel of a wing: in the case of a continuous wing or any wing having no central panel, the limits of the center section are arbitrarily defined by the location of points of attachments to the cabane struts of fuselege.
Center square. (Metalwk.) A tool used for finding the center of a circle or of an arc of a circle. Its most frequent use is in locating the center point on the end of a shaft or cylinder to be turned.
Center table. (Furn.) Any table, finished or decorated on all sides, suitable for the center of a room.
Centigrade scale. The scale of the cen
Centimeter tlgrade thermometer which rates 0 deg. as freezing point and 100 deg. as boiling point; used principally in scientific work.
Centimeter. A measure of length in the metric system equal to the onehundredth part of a meter; .3937 in.
Central station. (Elec.) A power plant from which electric light and power are supplied to consumers.
Centrifugal. (Shopwk.) Proceeding from the center.
Centrifugal flow engine. (Aero.) A gas turbine engine having a centrifugal compressor.
Centrifugal spark advance. (Auto. Elec.) The timer-distributor governor by which the spark is advanced or retarded as the engme speed varies.
Centrifugal switch. (Elec.) A switch used on the single-phase, splitphase motor to open the starting winding after the motor has almost reached synchronous speed.
Centrifugaltype super-charger. (Aero.) A high-speed rotary blower equipped with one or more multiblade impellers which through centrifugal action, compre&.'> the aif or mixture in the induction system.
Century. (Print.) A face of type commonly used in bookwork.
Ceramics. The art of producing things out of baked clay; also the articles so produced.
Cerasin. (Chern.) A yellow or white wax made by bleaching and purifying ozocerite, used as a substitute for beeswax.
Cerium. (Chern.) A rare metal found in the mineral cerite; specifit;. gravity 6.92; it resembles iron in colour and luster, but is soft and both malleable and ductile. Its pro-ducts are used in dyeing and in the manufacture of gas mantles; also in cigar lighters and gas lighters.
Certificate. (Noun) A document or written statement certifying as to certain accomplishments. (Verb) To certify or furnish with certificate.
Certosino. (Furn.) An inlay, in which bone or ivory is used on a dark wood, such as ebony.
Cerussite. (Min.) PbCO). An ore of lead. Colourless, white or yellow, transparent crystals.
Cesium. (Chern.) A silver white metallic element. An active ingredient in photoelectric cells.(Plurnb.) A pit for the reception: or detention of sewage.
Cetane rating. A measure of the ignition qualities of Diesel-engine fuels. Oils with a rating of 30 to 50 are classed as rough Diesel fuels and those from 50 to 80 as smooth Diesel fuels.
Chafe. To wear away as by friction. Chain drive. (Auto. Mech.) Power transmitted by chain belting. Silent chain is now largely used for camshaft and timing-gear drive which reduces noise to a minimum; the chief fault is looseness due to stretching caused by wear; easily adjusted if the chain is not too badly worn. Also applies to the rear-wheel drive by chain as
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