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Scientific American, Vol. 56, No. 14 (1887) (1887)
leaf 3
make it wire bent spirally at its center, to form a spiral spring, eccentric. And as the time-keeping qualities of any time each plate, which may be made either solid or box- which is placed on the loop. The ends of the lever ex- piece having a balance and hair spring depend upon the shaped, with… … tle-in that way. fixed to an ornamental leg provided © 1887 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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