Cycles per second to Cypress

Cycles per second. Abbreviated CPS, the term refers to the fre­quency of a sound or other regular waveform. CPS has now been re­placed by the equivalent term Hertz (Hz).
Cyclogiro. (Aero.) A type of rotor plane whose support in the air is normally derived trom airfoils me­chanically rotated about an axis perpendicular to the plane of sym­metry of the aircraft, the angle of attack of the airfoils being always less than the angle at which the airfoils stall.
Cycloid. A curve generated by a - point on a circle when that circle rolls on a straight line.
Cycloidal tooth. (Gear.) A type of gear tooth not now in common use. The side of the tooth is machined with a compound curve as distin­guished trom the involute tooth now in universal use.
Cyclotron. (Elec.) A device for accelerating positively charged particles (e.g., protons, deutrons, etc. )to high energies. The particles in an evacuated tank are guided in spiral paths by a static magnetic field while they are accelerated many times by an electric field of fixed trequency.
Cylinder. A circular body ofunifonn diameter, the extremeties of which are equal parallel circles. (Math.) Convex area = (circumference x height). Entire area = convex area + area of both ends. Volume = ,area of base x length of side.
Cylinder block. (Auto.) The main body of the engine which is bored to receive the pistons. The cylinder block and crankcase are trequently cast as one piece. .
Cylinder bore. (Auto. Mech.) The in­ternal diameter of an engine. cylin­der.
Cylinder head. Refers to the cylinder covers of an engine.
Cylinder oil. Mixture of mineral oil with 5 to 15 per cent of animal or vegetable oils.
Cylinder press. (Print.) A printing press consisting of a cylinder, a flat bed, and an automatic inIdng device.
Cylindrical gauge. (Mech.) A gauge consisting of two pieces, a plug gauge furnished with a handle, and a collar gauge into which the plug gauge fits. These guages are used for testing bored and turned parts which are to fit together.

Cylindroid. (Geom.) A solid body like a cylinder but with elliptical right sections.
Cyma. (Arch.) A commonly used molding having a reverse curve. There are two types, cyma recta and cyma reversa.
Cymatium. (Arch.) The portion ofa

cornice which contains a cyma curve.
Cypress. Grown in souther U.S. ; one of the most durable of woods; some­what like cedar, adapted to both in­ side and outside work in the build-. ing trades.