The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 160
being simply the torsion of a spring byelectromagnetic attraction. The current passes through a long, narrow vertical coil,of high resistance in the voltmeter and low resistancein the ammeter, within which is suspended a light soft-iron tube, which incloses a long spiral spring of phos-phor-bronze… … Fig. 56. vertical pin which passes through the glass ; a similarpin projects downward from the bottom of the brass capand passes through a hole in a support below, in whichit has a free vertical movement; so that the two pinshold the spring and tube in a vertical position ; and thetube being…
Electricity · Magnetism
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