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Scientific American, Vol. 13, No. 24 (February 20, 1858) (1858)

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An illustration from Scientific American, Vol. 13, No. 24 (February 20, 1858), 1858, leaf 0
VOL. XIII. NO. 24. … outside wires remained intact. Mr. D. asserts The regular inclination or dip of the needle, that the inside strands should be of sufficient which is now decreasing, will reach its mini- strength to withstand all the strain that may its motion through a pair of bevel gear wheels This improved…

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