The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 146
arries a light pointerof convenient length. The coil isflat and usually of sufficient hori-zontal diameter to inclose the lowerneedle entirely in any position; whilethe upper needle rotates over itsupper surface, and the pointer overa dial-plate with scale above. The needle is suspended at… … 130 DYNAMIC ELECTRICITY AND MAGNETISM. to rest in a fixed position more perfectly than can bedone by the torsion of a single fibre; the needle beingraised slightly when, by its deflection, the two threadsare twisted out of parallelism, and its weight tending tobring them back to the parallel…
Electricity · Magnetism
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