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GLOSSARY 385
Soft tube: A vacuum tube containing a slight residuum of gas, not so thoroughly exhausted as a hard tube.
Spark gap: A discharger across which the current flow disrupts air or other gas filling the 'gap."
Static: Disturbances of an electrical nature which are created by natural causes and which interfere materially with radio work. When static is exceptionally bad it may be impossible to receive sound without noises, which sound like heavy crashes or a "frying" noise.
Stopping condenser: A by-pass condenser used to block the passage of direct current in a circuit.
Storage battery: Battery which can be recharged at intervals whenever it is run down; a storage battery is employed to supply current for operating vacuum tube filaments, field current for receivers, and also B-battery plate voltage.
Transformer: Any device used in electrical and radio work for the transference of energy from one circuit to another with or without a change in the voltage as desired. Thus we have power transformers, amplifying transformers, telephone transformers, oscillation transformers, tuning transformers, etc. All transformers have a primary winding, receiving the initial current, which is passed on to the secondary winding with the same voltage, a higher voltage, or a lower voltage, according to the ratio which the primary and secondary windings bear to one another. A transformer is an alternating current device for changing the ratio of voltage to current in two interlinked circuits, a primary and a secondary.
Turntable: A rotating device used with Western Electric Sound Equipment, on which are mounted wax disks which produce sound in connection with reproducers.
Undamped: A train of high-frequency oscillations of constant amplitude, such as continuous waves.
Vacuum tube: In radio work this term is applied to a glass tube exhausted of air and containing essentially a filament for the