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Scientific American, Vol. 63, No. 13 (1890) (1890)

leaf 4

An illustration from Scientific American, Vol. 63, No. 13 (1890), 1890, leaf 4
iates any inter- gently and with decision by section commanders. The bar, lightly held in place by a finger spring, the free ference with the working of the gears, a result, accord- accuracy of range finders was fairly good, and the end of this bar having a ratchet-cut curved extension, ing to Mr.…

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