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Electric doorbell, 1926-1930.

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


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.

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© Science Museum / Science & Society Picture Library

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