TERMS AND EXPRESSIONS

Manawatu Times, Volume LII, Issue 6454, 11 November 1927, Page 11

TERMS AND EXPRESSIONS

SIMPLE EXPLANATIONS,

The following list is taken, from Harmsworth’s ‘Wireless Encyclopedia.’—

Step-down Transformer. —Name given to a special form of transformer in which the primary is ! wound with a great many more turns than the secondary, this having the effect of increasing the amperage, but decreasing the voltage which flows in the secondary circuit Induced by a current flowing in the primary. Its chief use in radio Is in the telephone circuit of a receiving set, permitting the use of a low-resistance telephones.

Step-up Transformer. —Name applied to a special pattern of transformer In which the secondary winding is comosed of many more turns than that of the primary, this having the effect of decreasing the amperage, but increasing the voltage in the secondary circuit, induced by a current flowing through the primary. It is used in radio work for low frequency amplification purposes.

Storage Battery.—A storage battery is an electrical appliance for the conversion of electrical energy into chemical, energy during the process of charging, and reconversion of the latter into the former when discharging.

Strays.—Name given to natural interference in a receiving sefv due to static or atmospherics. Sulphating. —Name used in connection with lead sulphate working out of the surface of the plates of an accumulator in the form of almost insoluble crystals, which are' poor conductors of electricity and difficult to remove.

Super Regeneration.—Term used to designate the principle embodied in a class of wireless receiving set that functions well over the normal oscillation point, where distortion appears in the usual circuits. Supersonic Heterodyne.—Type of receiving set due to Major E. H. Armstrong . It is particularly suitable for the reception of the shorter rang© of wave lengths from 200 metres downwards.

Sustained Waves. —This is another term occasionally used in radio for continuous waves.

S.W.G.—This is the usual abbreviation for standard wire gauge.

Symbols.—ln radio the pictorial or ether form of representation of wireless objects.

T. Aerial. —Name given to a type of aerial from which the lead-in is attached to the middle of the horizontal wire or wires.

Tapped Inductance. —The term tapped inductance is used to describe all forms of inductance coils provided with leads or connections at intervals along the length of the coil. Telephone Receiver. —A device which converts modulated electric currents into audible sound waves.

Television. —The transmission of sight through the ether. Terminal. —Names given to a metalic conductor to which, or from which, electric connections are made. Thermionic Amplifier.. Term sometimes used in radio for a threeeiectrode valve used as an amplifier. Thermionic Detector.—General name given to any; form of detector valve used in radio work. Three-electrode . Valve. —This Is. a common name for most radio valves. The three electrodes are named the filament, the grid, and the anode or plate.

Tickler Coupling.—American term for the reaction coil used to control the amount fed back from the anode circuit to the grid circuit in a regenative set..

Tinfoil. —A thin sheet of metal consisting chiefly of tin, extensively vised in radio work for the construction of various forms of fixed condenser.

Transformation Ratio.—ln a transformer the ratio between tbe number of turns in the primary to that in the secondary.

Transfer. —An appliance’ that transforms one form of current into .another.