Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 883
f the currentpassing round it varies as thetangent of the deflection of theneedle. The ring is generally 10or 12 inches in diameter, and mayconsist of a single band of copper,as in fig. 825, when a strong cur-rent is to be measured, or of anumber of turns of wire wound ona circular metal or wooden… … Fi(?. 825 The length of the needle should not exceed the twelfth part of the dia-meter of the circle ; an aluminium or glass index attached to it moves overa graduated circle and enables its deflection from the meridian to be read offwith ease and accuracy. We may determine the value of the…
Physics
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