Electric doorbell, 1926-1930.
3 5 c m
40cm
actual image size: 32cm x 27cm

Electric doorbell, 1926-1930.

© Science Museum / Science & Society Picture Library

Description

When the current is switched on, the electromagnet attracts a nearby piece of iron. The movement of the iron, known as the armature, can be used to switch on a separate electrical circuit. In this doorbell the armature also switches off its own circuit.
 

Image Ref.

10324313
 

buy a print

Select size
 
Select finish
 
How many prints?
 
£20.00
 

buy a framed print

buy a canvas

buy a framed canvas