Johann Salomo Christoph Schweigger, German physicist, c 1820.

 
Johann Salomo Christoph Schweigger, German physicist, c 1820.
4 0 c m
 
30cm
actual image size: 22cm x 32cm

Description

Johann Salomo Christoph Schweigger (1779-1857) invented the string galvanometer in 1820. Galvanometers measure electrical current and Schweigger's was a particularly sensitive device suitable for detecting small currents.

© Science Museum / Science & Society Picture Library

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