Recoil Kick. Reaction resulting from a disruptive discharge.
Recorder. In telegraphy, the receiving apparatus for recording the dot-and-dash signals on a strip or tape of paper.
Reduction. The influence exerted without apparent communication by a magnetic field or a charged mass upon neighboring bodies. The induction-coil is a simple example of this force. The current passes through the primary or inner coil about a core of soft iron, and in doing so it develops lines of force in the secondary or outer coils, although no current is flowing directly through them from a battery or dynamo.
Reduction Gear. A gear which acts to reduce a speed below that of a motor in full motion without lessening its motive force.
Refract. To break the natural course of light in an elastic medium. The rays of light, as they pass from a rare into a dense medium, are refracted.
Register, Electric. An apparatus for registering and recording the movements of employés about a building. Press-buttons are arranged throughout the building, and when a man passes a station he presses the button, and the time is recorded by the apparatus.
Regulator Magnet. (See [Magnet, Regulator].)
Relay. A telegraphic or telephonic receiving instrument which opens and closes a local circuit through movements caused by the impulses of currents received. The relay battery may be very delicate so as to work with weak currents. The function of the relay is to open and close circuits for the admission of a new current to push on the sound or vibration to a more distant point. The main battery may be of any desired power.
Relay Connection. A connection used in telegraphy, including a local battery, with a short circuit, normally open, but closed at will by a switch and sounder, or other appliance. A very weak current will work the apparatus.
Relay, Ordinary. A relay that is not polarized.