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Scientific American, Vol. 75, No. 22 (1896) (1896)
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, one beneath each readers that if the counterweights were permitted to shaft and gearing, so as to insure that the men on rail. The spans are framed as stringers to a header gir- fall vertically, the bridge would be raised at an accel- either side will work evenly. The counterweights, each der at… … © 1896 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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