Composition to Concentric jaw chuck.

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. Composition. A putting together of parts to fonn a whole. A compound as an alloy. (Fine Arts) The gen­eral arrangement or style of. the work. (Print.) That Part of printing which pertains tQ typ~setting, mak­ing up, etc.
Composition of forces. (Mech.) The process of finding a single which will produce the same effect as the joint action of all th~ other forces.
Comppositor. (Print.) One who sets type ofhand.
Compound. (Chem.) A union of two or more elements in a very definite proportion. The same compound always contains the same elements in the same p1"(~portions.
Compound arch. (Arch.) A type of arch made up of a number of con­centric archways, successively placed within and behind each other.
Compound generator. (E/ec.) See Compound wound.
Compound microscope. A micro­scope consisting of an objective lens with a short focal length and an eyepiece with a longer focal length, mounted in the same tube.
Compound rest. (Mach.) A second­ary slide, tool rest, and swivel plate superimposed on the cross slide and is capable of hand feed independ­ent of the lathe cross feed. It is of particular advantage in turning to a desired angle. I
Compound sliding table. (Mach.) The table of a machine tool to which the work is bolted and is pro­vided with I!.t least two movements, one longitudinal and the other trans­verse.
Compound wound. (E/ec.) A genefcl­tor or motor having a part of a se ries-field winding wound on top of a part of a shunt-field winding on each of the main pole pieces.
Compound' wound continuous current dynamo. (Elec.) A direct­current generator employing the use of a cumulative 'connection between its shunt and series fields, which will bring about an increase in field strength with an increase in load offsetting the natural tendency for the tenninal voltage to fall off.
Compressed air. Practically, air com­pressed to such a degree that it may be used as a source of power, as for the operation' of air tools etc.
Compressibility. (phys.) The pro­perty of matter which permits its molecules to be pushed closer together.
Compressing. (Bookbndg.) After the cover is placed on a book, the book is placed in a large press and allowed to remain until dry. This operation is "compressing."
Compression braking. (Auto. Mech.) Reducing the amount of gas fed to the engine and depending on engine compression for braking power when descending a hill.
Compression coupling. (Mech.) A coupling containing tapered parts which grip the shafting when a se­ries of bolts parallel to the shafting are drawn up.
'­Compressionignition engine. (Aero.) A type of engine in which the fuel is sprayed into the cylin­der and ignited by the heat of com­pression of the air charge.
Compression molding. (Pfast.) A method of plastic molding which is most generally used to form thermosetting plastic compounds into products. The molding compound, generally preheated, is placed into an open mold, the mold is closed, heat and pressure are applied by a downward moving press, whereupon the material softens and fills the mold cavity, undergoing a chemical change that hardens it. (SEE Injection and Extrusion.)
Compression ratio. (Auto. Mech.) Ratio between the atmospheric pressure when the piston is at the end of the down stroke and the pressure when the piston is in its top most position of the compression stroke. It is measured in atmospheres.
Compression ring. (Auto. Mech.) A type of piston ring used to reduce compression losses and to maintain oil seal. Usually the top or top and second rings on a piston.
Compression spring. (Mech.) A helical spring which is designed to operate under pressure, therefore tending to shorten when in action.
Compression stroke. (Auto. Mech.) The second stroke of the piston in a four-cycle engine, occurring when both intake and exhaust valves are closed.
Compressive strength. (Engin.) Re­sistance to forces tending to com­press, shorten, or crush.

Computer. (Math.) Analog-acts on internally stored information to solve complex mathematical problems. Digital-computes information in digital form. It is more accurate than the analog computer.
Concave. Hollowed. out; a curve re­cess; a bowl-shaped depression.
Concavo-concave. Concave on both side.
Concavo-convex. Concave on one side and eonvex on the other.

Concealed wiring. (Elec.) Wiring which has been run in a wall, flOor, . or ceiling and which does not appear on an exposed surface.
Concentrated. (Chem.) Containing relatively much solute.

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