The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 149
e, stretched in front 132 DYNAMIC ELMCTRiCITY AMD MAGNETISM. of the galvanometer mirror, indicates the exact centreof the spot of light, which is adjusted to zero by a curvedmagnet, attached above to a vertical rod, with its polesin opposition to those of the needle, and which can bemoved to any… … Fig. 51. brass pin and a sewing-needle into a drop of salt water,moving the spot of light half the length of the scale. The coils can be removed and coils of any requiredresistance up to 5000 ohms substituted ; and as theseand similar delicate measuring instruments are liable toinjury from powerful…
Electricity · Magnetism
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