Austin, Louis W. (Louis Winslow), 1867-1932, Thwing, Charles B. (Charles Burton), 1860-1946, joint author · Boston, Allyn and Bacon · leaf 104
the horizontal intensity of the earths field, H. In absolute units the unit of current is defined as thatcurrent which, flowing through a length of 1 cm., of anarc of 1 cm. radius, exerts a force of 1 dyne upon a unitmagnetic pole at the centre. If the unit current flowsthrough an arc of length I,… … Fig. 46. 92 PHYSICAL MEASUREMENT, The force of the earths field on a pole of strength ^ is7//x. Then, if we call the force of unit current upon unitpole — 2 wn J r = G,we have — —£ = tan a ; C = — tan a,i//* G in absolute units, or, in amperes, calling 10 H/ G= K,— C = K tan a. It is evident that K…
Physics
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