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Ayrton and Perry ammeters, late 19th century.

Ayrton and Perry ammeters, late 19th century.
3 4 c m
actual image size: 32cm x 26cm


Overall and cros section views, of ammeters developed by William Edward Ayrton (1847-1908) and John Perry (1850-1920). Most meters measure electricity by changing a little of the electrical energy into magnetism, and making the resulting magnetic force move a needle on a dial. This meter was one of the first to measure current and voltage reliably.

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