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Magnetic petrol gauge, 1927.

Magnetic petrol gauge, 1927.
3 4 c m
actual image size: 32cm x 26cm


A gauge for indicating the level of fuel in a motor car petrol tank, made by Simms Motor Units (1920) Ltd. This type of instrument was invented by T Martin in about 1912. The dial contains a pivoted magnetic needle which acts as a pointer. As the level of petrol in the tank falls, and the float with falls it, the motion of the float arm rotates a magnet by means of gears at the back of the dial, and this in turn moves the magnetised pointer.

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© Science Museum / Science & Society Picture Library

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