Cavity. (Plast.) Depression in a mold made by machining or hobbing or by both methods. Depending on the number of such depressions, molds are designed as "single cavity or multicavity. "
Cavity block. (Plast.) The housing or lower section of a mold in which the depression is sunk.
Cedar chest. (Furn.) A household chest of various sizes, especially used for storing woolens and furs because of its protection against moths.
Cedilla. (Print.) A mark used under the letter "c" to indicate that it shall have the sound of"s" as in facade.
Ceiling. (Aero.) Height of the lower level of a bank of clouds above the ground.
Ceiling balloon. (Aero.) A small free. balloon, whose rate of ascent is known, used to determine the ceilling.
Ceiling-height indicator. (Aero.) A device that measures the height from the horizontal to the illuminated spot produced by a ceiling projector as seen from a fixed position.
Ceiling joist. (Arch.) One of the timbers to which a ceilling is attached by lath and plaster or by other means.
Ceiling projector. (Aero.) A projector that produces an illuminated region on the underside of a cloud for the purpose of determining the height of that part of the cloud above the indicator.
Cell. (Elec.) A single element of an electric battery, eith~r primary or secondary .
Cellar. (Arch.) The room or rooms below the main portion of a building, usually containing the heating plant and accessories. The depth of a cellar is, all or in part, below ground level.
Cellaret. (Furn.) A deep drawer or compartment in a sideboard for holding bottles.
Cellophane. (Chern.) A trade name for a thin, transparent cellulose. Pricipal use is for wrapping purposes.
Cellule. (Aero.) In an airplane, the entire ~cture of the wings and wing trussing of the whole airplane on one side of the fuselage, or between fuselages or nacelles, where there are more than one.
Cellulith. Produced by grinding wood pulp to a homogenous mass and then drying it. It can be worked like wood and is a substitute for ebonite.
Celluloid. (Chern.) A compound of camphor and guncotton, very inflammable. (Furn.) An ivory substitute, used in marquetry.
Cellulose. (Chern.) An inert substance forming the chief part of the solid structure ( cell walls) of ph:~nts, wood, linen, paper, etc.
Cellulose acetate. (Chern. Plast.) Strength and toughness are outstanding features of this thermosetting plastic. Available in wide colour range for steering wheels, decorative novelties, fountain pens, electrical appliances, etc. This material machines in much the same manner as soft metals.
Cellulose acetate butyrate. (Chern.Plast.) Process of manufacture same as cellulose acetate for the use of a mixture of butyric and acetic acids
Cellulose nitrate
and anhydrides. Articles made from this plastic have lower moisture absorption and better resistance to weather than if made from cellulose acetate. Used as a molding compound for handles, cases, etc.
Cellulose nitrate. (Chem. Plast.) One of the oldest plastics; known by many names such as celluloid, pyralin, amerith, etc. Available as lacquers, emulsions, rods, tubes, and sheets. It has a wide application in a great variety of colours.
Cellulosic. (Plast.) A family ofthermoplastics which is based on the chemical treatment of carefully purified cotton linters. Familiar plastics such as Cellulose Nitrate, Cellulose Acetate, and others belong
in this category. Large volumes of these plastics are used in sheet for thermo forming of products such as signs and packaging items. Much is used in skin-packaging, in craft paper coating, and in blow-molded containers. (SEE PLASTICS)
Cell vent. (Elec.) A hole in the cell cap which permits the escape of the gases formed in the battery cell.
Celotex. A trade name for a fiber board made from sugar-cane waste. It is much used for wall covering, insulating, etc.
Celsius scale. The centigrade scale. From Anders Celsius (1701-44), who devised it.
Cement. (Plaster.) Generally used in reference to Portland cement, stucco, natural cements, etc. Mortar, plaster of Paris, or any substance which causes bodies to adhere to one another.
Cementation steel. (Metal.) A cutlery steel made in the cementation furnace. Owing to the cost of production the process has been but little used in America.
Cemented carbide tools. (Mach.) Tools made from pulverized carbides fused into hard tips for heavyduty or high-speed cutting of metals.
Cementing trowel. A tool similar to the plasterers trowel but often of heavier gauge stock.
Cementite. (Engin.) Iron combined with carbon as it exists in steel before hardening.
Center. A fixed point about which the
radius of a circle or of an arc moves.
Center distance. The distance between : (1) centers of holes in a machine part; (2) bearings supporting a shaft; (3) center lines of a drawing.
Center drill. (Mach.) A short' drill, used for centering work in order that it may be carried on the lathe centers. Center drills are usually made in combination with a countersink, which permits a double operation with one tool.
Centered. (Print.) The location of a line of type when the space on each side is equal.
Center gauge. A flat gauge used for setting a tool for the cutting of "V" threads.
Center head. (Mach.) A device attached to a scale or blade for use in locating the center of some round object; as the center point on the end of a shaft preliminary to centering.
Centering. (Arch. ) The false work over which an arch is formed. In concrete work the centering is known as the frames.
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