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Scientific American, Vol. 33, No. 17 (1875) (1875)
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, it is until the proper depth is reached: when, by the application in their way; and every year shows us fresh achievements further stated, will last longer, since no more metal is used of apump at the top, an abundance of fresh air could be than is necessary (see dotted lines in the engraving).… … © 1875 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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