Practical Mechanics for Boys Part 22

Cant. A form of lever.

Carbonate. A salt of carbonic acid.

Caustic. Capable of corroding or eating away.

Capillary. That quality of a liquid which causes it to move upwardly or along a solid with which it is in contact.

Caliper. An instrument for spanning inside and outside dimensions.

Centripetal. The force which tends to draw inwardly, or to the center.

Centrifugal. The outwardly-moving force from a body.

Centering. To form a point equidistant from a circular line.

Chloride. A compound of chlorine with one or more positive elements, such as, for instance, salt.

Circular pitch. The measurement around a gear taken at a point midway between the base and end of the teeth.

Circ.u.mference. The outside of a circular body.

Clef. A character placed on a staff of music to determine the pitch.

Clutch. A mechanical element for attaching one part to another.

Chuck, Independent. A disk of metal to be attached to the live spindle of a lathe, and which has on its face a set of dogs which move radially independently of each other.

Chuck, Universal. A disk to be attached as above, provided with dogs which are connected so they move radially in unison with each other.

Cla.s.sified. Arranged in order, in such a manner that each of a kind is placed under a suitable heading.

Clearance. To provide a s.p.a.ce behind the cutting edge of a tool which will not touch the work being cut.

Consistency. Harmonious; not contradictory.

Coherer. That instrument in a wireless telegraphy apparatus which detects the electrical impulses.

Commutator. The cylindrical structure on the end of an armature, which is designed to change the polarity of the current.

Concentrated. Brought together at one point.

Coinage. The system of making money from metals.

Compound. The unity of two or more elements.

Constant. Being insistent and consistent; also a term to be used in a problem which never varies.

Conversion. The change from one state to another.

Cone. A body larger at one end than at another; usually applied to a form which is cylindrical in shape but tapering, from end to end.

Compression. The bringing together of particles, or molecules.

Convolute. A spiral form of winding, 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 polis.h.i.+ng.

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

Combustion. The action or operation of burning.