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

Exton, David

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

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.

© Science Museum / Science & Society Picture Library

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