Rated revolutions to Reanmur

Rated revolutions to Rayonnant
developed by a given type of engine at the rated speed when op-erating at full throttle, or at a spe-cified altitude. or manifold pres-sure.
Rated revolutions. (Aero.) The num­ber of revolutions corresponding to the rated horsepower.
Rate fixing. Setting the cost of indi­vidual operations in a machine shop as a basis for mechanics wages.
Rate of climb. (Aero.) The vertical velocity of an aircraft with refer­ence to the air.
Rate-of-climb indicator. (Aero.) An instrument that indicates the rate of ascent or descent of an aircraft.
Rate of combustion. The number of pounds of coal burned per square foot of grate per hour. '
Rated Output Power. The maximum power that an amplifier will deliver continuously without exceeding its specified distortion rating. Must be qualified to be useful.
Rate of speed. (Mach.) In machine . work rate of speed may be ex­pressed in revolutions per minute; r.p.m. or in feet per minute.
Rating of alternators. (Elec.) The rating of alternators or alternating­current generators is usually expressed in kVA, or kilovolt­amperes, which is the product of the voltage times the amperage, divided by 1,000. Ratio. Relative value; proportion. Ratio Detector. Circuit in an FM tuner for extracting audio signals from modulated radio or intermediate frequency signals.
Ratio of transformation. Radio of the number of turns on the pri­mary coil to the number of turns. on the secondary coil of a trans­former, affecting both voltage and current.
Rattail file. Name commonly applied to round files.
Rat-tail splice. (Elec.) (SEE PIGTAILSPLICE.)
Rawhide. (Leather.) Untanned, dressed skin.
Rawhide gears. (Mach.) Noiseless gears made of tightly compressed disks of rawhide.
Rawhide hammer. A hand hammer having a rawhide head which serves to prevent bruising metal parts against which it is. Us.ed.
Raw material. The ingredients be­fore being processed, which enter into a finished product.
Raw Tape. Unrecorded or "blank" . recording tape. Ray. A narrow beam of light and the line along which it is radiated. Rayleigh's law. In magnetic materi­als subjected to magnetic field low in comparison with the maximum coercive force, the hysterisis loss in a cycle varies directly as the cube of the magnetic

flux denity. The law ceases to be valid at the field at which the Barkhausen effect takes place.
Rayon. (Textile) Formerly called arti­ficial silk. It is a manufactured fibre of regenerated cellulose.
Rayonnant. (Furn.) Ornamented by radiating lines. A term applied toRaze to Reanmur thermometer French Gothic ornamentation of the middle period.
Raze. To tear down; to demolish; as to raze a building.
Reactance. (Elec.) In an alternating current circuit, that component of the resistance that does not op­pose the current, but tends to cause a difference of phase between it and the electromotive force. The measure of resistance to the flow of an a.c. current through a coil or a condenser.
Reaction. A reverse movement or ten­dency; the instantaneous response of a system to an applied force, manifested as the exertion of a force equal in magnitude but op­posite in direction to the applied force.

Reaction engine. (Aero.) Or reaction motor. An engine or motor that develops thrust by its reaction to a substance ejected from it.
Reaction turbine. (Aero.) A type of turbine having rotor blades shaped such that they form a ring of nozzles, the turbine being rotated by the reaction of the fluid ejected from between the- blades.
Reactive. Pertaining to or characte­rised by reactance.
Reactive current. The component of an alternating current that is in quadrature with the voltage.
Reactor. (Elec.) Any device which offers opposition to the flow of alternating currents; usually con­sists of turns of wire on iron cores.
Ready print. (Print.)-Those sections of newspapers bought printed ready for issue, such as magazine sections, sheets of comics, etc.
Reagent. (Chern.) Term used in ana­lytical chemistry. A chemical used to bring about a desired change in another substance, or l ~etect the presence of another sut 'tance.
Ream. (Shopwk.) To smooth the sur­face of a hole and finish it to size with a reamer as for a running fit. (Paper) Twenty quires or 480 sheets of paper. A printeR ream is 516 sheets.
Reamer. (Metalwk.) A tool with cut­ting edges, square or fluted, used for finishing drilled holes.
Reaming. (Metalwk.) The process of smoothing the surface of holes with a reamer.
Rear axle. (Auto.) Consists of rear axle housing; gears, axle shafts, and. drive, also such accessory parts as are needed for operation, as bearings, washers, etc.

Reaumur thermometer. (Phys.) A thermometer used in a number of European countries. Zero, 9 dg. is given as the melting point of ice