Illustration showing Kelvin's (Thompson's) mirror

Illustration showing Kelvin's (Thompson's) mirror galvanometer, showing how the light source at D is reflected off the mirror of the galvanometer on to 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'. 1874

Current Depends Flowing Galvanometer Kelvin Measurement Reflected Source Wheatstone

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