Scientific American JANUARY 21, 1899.] 41 = … may be conveyed to the screw shaft in general very imperfect. Attempts READY FOR THE ASCENT. have been made, but not very suc- projecting forward to revolve a ““serew sail,” 15 feet in diameter. cessfully, to establish a gamut of odors, and it is difficult in many To permit of swifter revolution…
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