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Scientific American, Vol. 88, No. 19 (1903) (1903)
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e description of these ob- ropes which are stretched across the path. The ropes jects themselves, which will appear in their forthcom- pass through blocks, and are secured to chains which ing memoirs, will add a new and interesting chapter are dragged along the floor or ground, gradually to the… … © 1903 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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