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GLOSSARY 381
Grid leak: A resistor connected across a condenser in the grid filament circuit of an audion. A very high, non-inductive resistance connected across the grid condenser or between the grid and the filament of a vacuum tube to permit excessive electrical charges to leak off to an external source, thus furnishing stable control under all operating conditions.
Ground (or earth, which is the term used in England): The term "ground" is used for any connection with the earth, a river, or the sea.
Hard tube: A vacuum tube from which practically all gas has been exhausted.
Henry: The practical unit of self-induction or inductance.
Hook-up: A diagram showing the wiring of any wireless receiving or transmitting set or any other electrical device.
Impedance: This is the term applied to the resistance offered by a coil of wire to a current flowing through it due to the combined action of its reactance and of the actual resistance of the conductor in ohms. This counteracts the flow of current to a greater or less degree. Impedance may be said to be the result of reaction, or the quality that tends to hold back the flow of current produced by an alternating electromotive force.
Inductance: Inductance, like capacity, plays a very prominent part in all alternating current circuits. It is that quality in a circuit which causes a current flowing through the circuit to create a magnetic field interlinked with it. The unit of inductance is the Henry. Inductance is the magnetic energy-storing property exhibited by coils of wire, and is greatly increased if the coil has a cone of magnetic material such as iron.
Inductor: Any part of an electrical apparatus which acts inductively on another part.
Input circuit: The circuit through which power is let into a device.
Insulator: A non-conductive material through which electricity passes only in negligible quantities.