This page consists of two different models with the same GEC catalogue number
Consisting a Hand Microtelephone with Battery Key in Ebonite. Circular Call
Bell with 3 inch Gong, Ringing Key, Induction and Impedance Coils, Step by
Step improved Line Line Selector and Suspension Hook. The Line Terminals are
concealed at the back of the instrument.
The advantage of these instruments over other forms is that only one set of batteries is required for a complete installation, instead of separate batteries for each instrument as ordinarily used.
Available with 5 lines, 10 lines or 15 lines.
IRON CASED AND WEATHERPROOF
These telephones were specifically made for flat entrance use. They are ironclad, watertight and have a flexible receiver arm. Supplied with 5, 15, 21 or 30 lines according to requirements.
The Tradesman's Battery Call 'Service' Telephone is designed primarily for the convenience of occupiers of large modern blocks of fiats, who frequently suffer annoyance from tradesmen's representatives calling from door to door to solicit or deliver orders. This trouble can easily be overcome by the use of the Battery Call Service Telephone System here described.
Made in cast iron case, the K7915 is weatherproof and can be fixed near the service or in any other convenient position either in or outside the building. Simple to operate and efficient in its service, this system not only prevents the annoyance referred to above, but is noiseless and a time saver.
By means of the selector switch any one of a numbered series of flats can be selected called by pressing the ringing key button.
The receiver, which is fitted into an iron case attached to a flexible metal tube, when raised to the ear automatically connects the speaking battery to the transmitter, the latter is mounted on the back of the front plate and indicated by the perforated disc, into which the caller should speak.
A conversation having been finished, the receiver automatically returns to its normal position and cuts off the battery current.
The necessary wiring is simple, as only one wire from each flat to the K7915 is necessary, and two common wires throughout from the central battery of three to four cells.
Telephone instruments K7820, K7842, K7843, K7847, K7851 & K7855 are suitable instruments for use in the flat.
Taken from the 1926 GEC catalogue and also found in the 1932 catalogue
Last revised: February 01, 2011