Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 518
he needle, Mg. 387,so placed that the needle isat the center of the commonaxis), in the center of whichis either a small compassneedle or a needle suspendedby a silk fiber. A needle thus placed in thefield of a current is acted onby a mechanical couple tend-ing to place it at right anglesto the… … HrThe formula for the tangent galvanometer is C = r— tan B = 2ir?i K tan 8, in which C is the current strength in C.G.S. units; H, as above, measured in dynes; B, the angle of deflection; and r, the 498 ETHER DYNAMICS. mean radius of the coil of n turns. K, which is called the reductionfactor of…
Physics
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