gec.gif (1164 bytes)GEC K 40 & K 41

K 40


This well-known instrument ranks as a pioneer of Battery Ringing Telephones, having made its advent very shortly after the expiration of the Telephone patents. It still maintains its position as the most satisfactory Battery Call Telephone Set at a moderate price, it consists of the following parts: "Hunningscone-Deckert" Microphone, Induction Coil, Double Pole 'Watch' Receiver. Call Bell, Ringing Key. and Automatic Switch Hook, mounted in solid Walnut Case, with all metal parts Nickel-plated. Can be used very satisfactorily on lines up to half a mile in length.

Price in 1904 - £1.5.0.

K 41
The same construction as K 40, but with 'Bell' instead of 'Watch' Receiver.

Price in 1904 - £1.8.0.

Described as a Midland Railway type in an annotation found in a copy of the Peel Conner Illustrated Telephone Catalogue, 9th edition, belonging to the cabinet works.


Taken from the G.E.C. Illustrated Telephone Catalogue 9th edition (1904)


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:-

  1. Connect the three batteries in series.
  2. Connect the free negative terminal of the battery set to terminal ZE on the phone.
  3. Connect the free positive terminal of the battery set to terminal C on the phone.
  4. Connect the positive terminal of the centre battery to terminal MC on the phone.

Connect the two phones together as follows:-

  1. Connect terminal ZE of one phone to terminal ZE of the other.
  2. 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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Last revised: May 18, 2024