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Scientific American, Vol. 37, No. 17 (1877) (1877)
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sily be wound up again and magnesium. The calcium, though less abundant than was full of water, and the manhole covers being downwards, by a handle, or the drum may be made double as shown at theright of the engraving and have two ropes upon ‘it— it was considered probable that one of them had been… … © 1877 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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