Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 244
Fig. 146. Fig. 147. The accuracy with which the position of the galvanometerneedle can be read is much increased by the use of a mirror asalready described by which a beam of light is reflected onto a scale. Figs. 147 and 148 shew such instruments. In Fig. 148 there are two magnets so that the…
Electricity · Magnetism
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