Synchronous mains electric clock of the self-starting type, c 1934.
3 2 c m
40cm
actual image size: 32cm x 24cm

Synchronous mains electric clock of the self-starting type, c 1934.

Exton, David

© Science Museum / Science & Society Picture Library

Description

Clock with digital display made by The Westinghouse Electric Supply Co, USA. Clocks such as this used synchronous electric motors and depended on the frequency of mains electricity, via the new national grid, for their timekeeping.
 

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Image Ref.

10433075
 

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