Some later variants of the Telephone No. 746 and 8746 were fitted with a
single coil bell, called the Unicoil bell. This bell could also be
supplied with a volume control.
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| The above picture shows the Unicoil bell and
volume mechanism. The lever projecting from the front of
the case, can be moved from side to side. There is a
spring attached to the lever (visible just above the bell plate)
and this spring restricts the movement of the bell clapper arm. |
| |
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| The volume arm removed from the mechanism.
The restrictor spring is shown centrally. |
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