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Street fire alarm
telephone
These were used in simple direct public telephone fire alarm posts or call
offices. The telephone is wooden cased and housed
in a Boydell head (pictured below) 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
of 60ohms resistance, with no permanent magnet and fitted with a Diaphragm No. 12
and an Earpiece No. 12. The receiver and transmitter are wired in
series.
The receiver cord is automatically wound onto a cotton reel type of device
when the receiver is replaced on the switch hook.
This is a C.B. telephone. A Magneto version
was also produced, called the Telephone No. 99.
Dimensions - 9"h x 9"w x 6.5"d.
Telephone includes (1928):-
1 x Cord, Instrument No. 222, waterproof.
1 x Roller, spring, for receiver cord.
1 x Cord, Instrument 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, Instrument No. 2/F, Black.
2 x Protectors G.
1 x Receiver, Bell No. 1A.
1 x Cord, Instrument 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, Leclanche, DR 2.
Circuit diagram - N197.
Circuit diagram - F.A. 109
Drawing - 8121 (Mark 2).
GPO Engineering Instructions on Fire Systems
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