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Scientific American, Vol. 78, No. 15 (1898) (1898)
leaf 7
as the needles. couple of binding wires are laid in before the coil is hole through it is just a trifle smaller than thelens. A Finding that the light needles and the low-resistance wound. About six layers of the wire above mentioned narrow V-shaped groove is then cut around the center coils gave… … © 1898 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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