The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 479
n diameter, an aluminiumvane intended to steady the movements being connected tothe combination. The two sets of magnets are rigidly joinedtogether in the same plane, but so that the north poles of thetop set are over the south poles of the lower set, this formingan astatic combination, by means of… … iii jok Fig. 425.—Kelvin Mirror Galvanometer ELECTRICAL MEASUREMENTS 45* up that a current passing through all, tends to turn thecombination in the same direction. The terminals of theinstrument are fixed on an ebonite base, fitted with spiritlevels and levelling screws, and the coils, etc., are…
Telephone
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