Standard CBS No. 1 wall telephone with no magneto generator.

Wooden Local Battery telephone with sloping writing shelf.

The set shown to the right was made by Ericsson.

A later version was made, the Mk 238, which was oblong in shape (see pictures below).

Fitted with a Transmitter No. 2 although earlier types had a Transmitter No. 6.

Circuit diagram - N103.

This telephone could also work on CBS No. 2 & 3 exchanges by the addition of a capacitor.

Telephone No. 11 was the magneto equivalent.

Drawing No. 8830

Supplied by Ericsson, their Model N20141

GPO instructions state that this telephone should be fixed to the wall with it's lower edge 36 inches from the floor.

Later version, the Mark 238
Disregard the mouthpiece!
Inside the telephone - the silver cylindrical object 
is a modern style capacitor
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Last revised: January 04, 2019