Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 429
Fig. 2 a. Fig. 2 b. Action of an electric current on a compass needle. still tend to turn round in the direction of the hands of a watch. Thesouth pole tends to go in the opposite direction. Another means hasbeen proposed for indicating the direction of motion of the compassneedle. If a man be…
Science · Technology · Meteorology · Patents
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