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GROUND: American term for "earth."
H.F.: High frequency. Frequencies above those of 14,000 cycles per second, and sometimes known as the supersonic. Low frequencies are those below this figure — the audio or sound frequencies heard by man.
INSULATION: A non-conductive material used for the protection of an electrical circuit or used to separate circuits.
INSULATION TAPE: A specially made non-conductive and adhesive tape used for covering cable joins, etc. Ordinary adhesive tape should not be used for insulation purposes.
INTERMITTENT MOVEMENT: The mechanism which actuates the movements of the intermittent sprocket or claws in a cine projector.
INCHING KNOB: A knob which allows the operator to turn over the motor, or the motor and mechanism, by hand. Chiefly used for examining the threading (lacing) of the film.
JACK PLUG: A telephone switchboard-type of plug-connector, mostly used for the gram and microphone inputs in an amplifier.
JUNCTION BOX: A joint in a metal conduit. A 4-way junction box is one which connects 4 conduits. They are usually so designed that they are easily opened for inspection or servicing, etc., of the wires they enclose and protect.
KATHODE OR CATHODE: Usually the filament of a thermionic valve, and from which the electrons are emitted when heated by the passage of an electric current. A cathode may also describe the negative pole of an electric current in circuit.
KNIFE SWITCH: A switch opening and closing after the manner of the blade of a pocket knife. Contact is made when the blade is closed.
LEAD: A cable or wire used for a specific purpose, such as the speaker or mains lead. Pronounced as "leed."
LEADER: A length of white (or black) opaque film attached to the beginning of a spool of film, and long enough to be used for threading the film in the projector. Saves the actual start of the film from damage should a fault occur on starting the projector.
LENS MOUNT: The casing or that part of a machine into which the lens is fitted.
MAGAZINE: The projector spool compartments — only used on standard (35-m.m.) projectors and one or two 16-m.m. machines of French design. The film-can on a strip-projector may also be termed a magazine.
MICROPHONIC: A term denoting that a valve or lamp is faulty. The filaments or casing may excessively vibrate, perhaps "in sympathy" with other mechanical vibrations, and the valve then transmits the new and unwanted frequency through the rest of the amplifier to the speaker. The fault is heard as a prolonged whistling or ringing tone, and may sometimes be cured by shielding the valve from the vibrations from the other valves or by binding the glass with insulation tape. A microphonic exciter lamp should be changed as soon as possible.
NEGATIVE FILM: The exposed film after developing, showing the lights and shadows reversed from the normal.
NON-SYNC: Non-synchronisation. Any apparatus providing sound not synchronised with the film, such as the microphone and the electric gramophone. The latter is usually known as the non-sync.
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