BELL No. 40
|Wooden indoor D.C. Trembler bell, with Church style gong, used on fire alarm
systems. Later bells casings were constructed out of plastic.
Bell 40A - Twin 50 ohm coils, 2-10 volts - used on London Fire Brigade systems.
Bell 40B - Twin 250 ohm coils, 10-50 volts - used in PO buildings and specified for omnibus call-bell systems.
Fitted with Bell-gong No. 21 (4.5in diameter x 3.1in - Church style).
Found in the Rate Book 1947 and 1956.
Diagram - N640.
Picture of wooden Bell taken 1937.
Last revised: December 02, 2020