Engraving depicting Lord Kelvin's mirror galvanometer

Engraving depicting Lord William Thomson Kelvin's galvanometer, showing how the light source at D is reflected off the mirror of the galvanometer on the scale E, E. The angle of the mirror, and so the measurement read off the scale, depends here on the current flowing through the Wheatstone bridge, A, A, B, B

Current Depends Flowing Galvanometer Kelvin Measurement Reflected Source Thomson Wheatstone

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