Snow, Benjamin Warner, 1860- · Madison, Wis. · leaf 554
N Fig. 278. The astatic needle. … Fig. 279. The flow of currentabout the astatic needle. The astatic needle, therefore, tends to set itself north andsouth with a very feeble force, which, indeed, is only the differ-ence between the effects of the earths field upon the two needles,and this difterence may be made exceedingly small by…
Physics
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