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Scientific American, Vol. 64, No. 3 (January 1891) (1891)

leaf 3

An illustration from Scientific American, Vol. 64, No. 3 (January 1891), 1891, leaf 3
lever extending to within convenient on stepping upon the bridge must avoid using the ed of a round piece of wood two and a half inches in same foot as the one who precedes him. reach of the driver, the frame carrying the cutters diameter and five feet in length. A height of l\% may be readily… … the respiration and circulation being affected only in the latter case. Fig. 6.-P0RTABLE FOOT BRIDGE. ©1891 SCIENTIFIC AMERICAN, INC.

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