A course of experiments in physical measurement (1897)
Whiting, Harold, d. 1895 · Boston, D.C. Heath and Co. · leaf 457
NETIC DIP. [Exp. 77. of force which pass through the square in its threedifferent positions. From these data we may infer the direction of thelines of magnetic force. If, for instance, the throwof the needle is much greater when the square isturned over on the north wall of the room than onthe west… … EiG. 212. the square is turned over on the floor than on eitherwall, we may infer that the lines of force are morenearly vertical than horizontal. We will suppose, forsimplicity, that the walls of the room face exactlynorth and west by the compass, so that no lines offorce pass through the loop…
Physics
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