like a watch spring.

Coiled. A form of winding, like a string wound around a
bobbin.

Conductivity. Applied generally to the quality of material which
will carry a current of electricity; also a quality
of a material to convey heat.

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