Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 48
poles is simply to compare the chap, ii.] Field of Magnetic Force. 29 forces they respectively exert on the same pole when placed atthe same distance from it. This comparison may be made by either of the abovemethods, simply changing the one pole for the other of twomagnets to be tested, keeping… … sides of the short suspended needle of the last experiment, andmove one of them backwards and forwards till the suspendedneedle remains in the meridian. The strengths of field at 0due to M and to N must then be equal, and we shall havestrength of pole M at distance CM equal to that of the poleN at…
Electricity
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