A descriptive and historical account of hydraulic and other machines for raising water (1850)
Ewbank, Thomas, 1792-1870 · New York, Bangs, Platt, & Co. · leaf 164
lowing words, has been fully and practical-ly developed by a French engineer. A double water screw, the inner-most to mount the water, and the outermost for it to descend, more innumber of threads, and consequently in quantity of water, though muchshorter than the innermost screw by which the water… … No. No. 61. No. 62. No. 60. represents two separate screws formed on the same axis, oneof which, A, is long and narrow and serves for the nucleus of C, whichis much wider and shorter. This is designed to propel the former. Thethreads of both wind round the axis in opposite directions, so that when…
Pumping machinery
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