Cohesion

The force by which the molecules of the same kind are held together.

Concentric

A line which is equidistant at all points from a center.

Confined

Held within certain bounds.

Corpuscular

Molecular or atomic form.

Converge

To come together from all points.

Concave

A surface which is depressed or sunken.

Convex

A surface which is raised, or projects beyond the surface of the edges.

Component

One of the elements in a problem or in a compound.

Coefficient

A number indicating the degree or quality possessed by a substance. An invariable unit.

Cube

A body having six equal sides.

Cross-section

A term used to designate that line which is at right angles to the line running from the view point.

Cross slide

The metal plate on a lathe which holds the tool post, and which is controlled, usually, by a screw.

Contiguous

Close to; near at hand.

Countersink

The depression around a bore.

Collet

A collar, clutch or clamping piece, which has jaws to hold a bar or rod.

Countershaft

A shaft which has thereon pulleys or gears to connect operatively with the gears or pulleys on a machine, and change the speed.

Conducive

Tending to; promotive of a result.

Corundum

An extremely hard aluminum oxide used for polishing.

Cold chisel

A term applied to an extremely hard chisel used for cutting and chipping metal.

Combustion

The action or operation of burning.

Conjunctively

Acting together.

Comparatively

Similitude or resemblance, one with another.

Cotter

A key to prevent a wheel turning on its shaft.

Dead center

A term used to designate the inoperative point of the crank.

Depicting

Showing; setting forth.

Deodorant

A substance which will decompose odors.

Developer

A chemical which will bring out the picture in making the film or plate in photography.

Decimeter

The length of one-tenth of a meter in the metric system.

Decameter

The length of ten meters in the metric system.

Defective

Not perfect; wrong in some particular.

Diaphragm

A plate, such as used in a telephone system, to receive and transmit vibrations.

Dissolving

To change from a solid to a liquid condition.

Division plate

A perforated plate in a gear-cutting machine, to aid in dividing the teeth of a wheel.

Dispelled

To drive away or scatter.

Disinfectant

A material which will destroy harmful germs.

Diametral pitch

The number of teeth in a gear as calculated on the pitch line.