Street fire alarm telephone
These were used in simple direct public telephone fire alarm posts or call offices.  They are housed in Boydell heads (pictured lower left) which are mounted on posts, on the pavement, or attached to convenient walls.

The earlier version is fitted with a Receiver, Bell No. 4, which is 60 ohms resistance and has no permanent magnet. Fitted with a Diaphragm No. 12 and an Earpiece No. 12.

This is a CB telephone.

Telephone includes (1928):-
1 x Cord, Inst., No. 222, waterproof.
1 x Roller, spring, for receiver cord.
1 x Cord, inst., No. 248.
4 x Springs, clip, Protector, G.
1 x Hook, Receiver, J.
1 x Switch, Receiver, No.2.
2 x Protectors, G.
1 x Terminal No. 9.
1 x Receiver, Bell, No. 4A (Mark 234).
1 x Transmitter, No. 1.

Telephone includes (1947 and 1956):-
1 x Cordage, Inst., No. 2/F, Black.
2 x Protectors, G.
1 x Receiver, Bell, No. 1A.
1 x Cord, Inst., No. 2/22B, Brown, 33".
1 x Roller, spring, for receiver cord.
4 x Springs, Clip, Protector, G.
1 x Coil, Induction, No. 1 or No. 12.
1 x Switch Receiver, No. 2.
1 x Generator, No. 4C.
1 x Transmitter, No. 22.
1 x Hook, Receiver, J.

To be requisitioned separately:-
2 x Cells, Leclanché, DR 2.

Diagram F.A. 109

GPO Engineering Instructions on Fire Systems

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Last revised: September 20, 2020