Resistance to Revolving

Resistance box to Resonance radiation

Resistance box. (Elec.) A box con­taining known resistances, the amount of which can be varied by means of plugs or dials.
Resistance brazing. An electric braz­ing process wherein the heat is obtained from the resistance to the flow of an electric currenl
Resistance butt welding. A group of resistance-welding processes wherein the fusion occurs over the entire cross-sectional area.
Resistance unit. (Auto.) A small coil of wire made of a metal highly resistant to the flow of electrons, or a small bat of carbon. (Both . types are used interchangeably.) These units are introduced in cer­tain aut~ electrical circuits to re­duce the flow of electric current through the circuit. Resistance welder. A resistance weld­ing machine. (The term "welder" has sometimes been used to de­note an operator of welding equip­ment for which the term "welding operator" is greatly to be pre­ferred.)
Resistance welding. A pressure weld­ing process wherein the heat is obtained from the resistance to the flow of an electirc current.
Resistance wire. (Elec.) Nickel-chro­mium electrical resistance wire sold under a number of trade names.
Resisting moment. (Engin.) The resistance to rotation by the mo­ment of tensile and compressive stresses in that section which act as an internal couple.

Resisting shear. (Engin.) The inter­nal opposing forces equal to the vertical shear of a section.
Resist printing. (Textile) A dyeing process in which portions of' the fabric are covered with dye-resis­tant paste.
Resolution. (TeL) Picture fidelity (bet­ ter than 16 mm.).
Resolution of forees. (Phys.) The operation of finding two or more forces whose combined effect is equivalent to that of a given force.
Resolve. To separate and make visi­ble the individual parts of an im­age.
Resonance. The state of a system in which an abnormally large vibra­tion is produced in response to an external stimulus, occurring when the frequency of the stimulus is the same, or nearly the same, as a natural vibration frequency; the condition of a circuit with respect to a given frequency or the like in which the net reactance is a mini­mum and the current flow a maxi­mum.

Resonance radiation. Radiationemitted by an atom or molecule, having the same frequency as that of an incident particle, as a pho­ton, and involving a transition to

Reverse curve to Revolving door from the roof. Reverse curve. An S curve. Reverse mold. (Fdry.) A dummy mold on which a portion of an actual mold is to be rammed.
Reverse plate. (Print.) A printing plate which prints white and balck in reverse, producing a white de­sign on a black background.
Reverse turn. (Aero.) A reverse in flight produced by a half loop and a half roll.
Reversible propeller. (Aero.) A pro­peller whose pitch may be changed to a negative angle so as to give reverse thrust used for braking action.
Reversing gear. (Mech.) The gear by which the reversal of an engine or machine is accomplished.
Revise. (Print.) (I) To check for error; to alter or change with the idea .of improving. (2) A proof taken after corrections have been made.
Revolution. (Shopwk.) The act of revolving, as the turning in a com­plete circuit of a body on its axis. Usually distinguished from rota­tion, which may mean a revolution or a part of a revolution, while the term revolution is applied to something having continuous motion, as a revolution of a shaft.
Revolution counter. (Mech.) Also called "speed indicator". It is a device for counting the revolutions of a shaft. By pressing a pointer against the end of a shaft, the revo­lutions are registered on a dial. Revolutions per minute. An expres­sion referring to rate of speed of machine. Abbreviation, r.p.m.
Revolving door. (Arch.) A door with four vanes operating in a curved frame and mounted on a ceniral

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