Ceramic light switch, c 1900.
4 0 c m
 
32cm
actual image size: 24cm x 32cm

Ceramic light switch, c 1900.

© Science Museum / Science & Society Picture Library

Description

Switch shown in the 'on' position. The metal components of this early electrical switch are encased in a ceramic body. Two metal arms are sprung so they flick from one position to another. When the spring is turned on, the arms slot into U-shaped springy contacts, so completing the electrical circuit. This must happen fast, and the contacts must be good, or the electricity could spark acros any gaps and cause damage.
 

Image Ref.

10326003
 

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