| K7850
Peel Conner Battery Call Telephone
Table pattern battery call telephone electrically similar K7843 but fitted with cord
and rosette.
This instrument is constructed of polished walnut and the
finish of all external metal work is oxidised.
Cost in 1916 was £2.6.6
Cost in 1926 was £4.7.6
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| Early Model - 1916 |
Later Model - 1926 |
Found in the 1916 and 1926 GEC catalogues
Wiring two Telephones together
Each telephone requires three 1.5 volt batteries. The phones are
normally connected together by two wires, but if the ZE terminal is
connected to a good earth then only the L terminals are connected together
with one wire. It is recommended to use two wires and dispense with
the earth connection.
At each telephone connect the batteries as follows:-
- Connect the three batteries in series.
- Connect the free negative terminal of the battery set to terminal ZE
on the phone.
- Connect the free positive terminal of the battery set to terminal C
on the phone.
- Connect the positive terminal of the centre battery to terminal MC
on the phone.
Connect the two phones together as follows:-
- Connect terminal ZE of one phone to terminal ZE of the other.
- Connect terminal L of one phone to terminal L of the other.
Wiring diagram
In the diagram the following abbreviations are:-
C = Carbon (Positive terminal of battery).
Z = Zinc (Casing and negative of battery).
MC = Microphone Carbon.
L = Line.
ZE = Zinc earth (this is connected to earth if only one line wire is used to
connect the telephones together. If two line wires are used then just
connect the second wire to ZE and ZE).
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GEC K7850