The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 145
8 DYNAMIC ELECTRICITY AND MAGNETISM. hut as it is difficult to do this with requisite accuracy,the scale of degrees is usually preferred, the values ofthe tangents corresponding to the deflections beingeasily ascertained from a table. The Helmholtz-Gaugain tangent galvanometer isillustrated by Fig.… … FlG. 48. ment insures much greater uniformity of field than canbe obtained from a single coil, and still greater uni-formity could be obtained by the addition of a thirdcoil, midway between the two, and of such diameterthat each of the three should be equally distant fromthe centre of the needle.…
Electricity · Magnetism
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