Telephone used on the switching floors of GPO telephone exchanges and known as the "Special Fault Phone".

The Telephone is effectively a wooden wall board which has fitted to it: 2 docket holders, a siren, a capacitor, a telephone (on a Bracket No. 12), 2 notice frames and a box with a hinged lid fitted at the bottom of the board.

Faults were allocated to certain areas within the floor of the exchange and these were on paper slips called dockets.  These dockets would be stored in the holders and acted upon.  The lidded box held information, on cards, about the equipment that that section patrolled.

The notice frames generally held any information that the engineers felt should be held there.

Mark 3 - Bellset No. 26 fitted under telephone bracket (1936).
Mark 4 - No Bellset - replaced by capacitor and Block terminal (1945).

Introduced circa 1934.

Telephone includes (1956):-
1 x Block, Terminal No. 20/8, Black.
1 x Glass No. 32.
2 x Glass No. 34.
1 x Bracket, Telephone No. 12.
2 x Labels No. 42, White.
1 x Buzzer No. 25A.
1 x Telephone No. 232 CB.
1 x Capacitor, M.C. No. 102.
1 x Ticket-clip No. 10.
2 x Ticket-racks No. 2.
1 x Cord, Instrument No. 3/63 KB, 18".
1 x Frame, Notice No. 19.
2 x Frame, Notice No. 21.

Circuit diagram - N243.

Circuit diagram - AT 1862.

Drawings No. 60092, 60607/0, 60607/1 and 60607/2.

Mark 4



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Last revised: January 31, 2023