A descriptive and historical account of hydraulic and other machines for raising water (1842)
Ewbank, Thomas · Tilt & Bogue · leaf 250
the upper one is the pump ; the lower one the ^ mill . The area of the lower one should be to that of the upper in the inverse ratio of the perpendicular height , and as much more as is necessary to overcome the fric - No . 96 . West ’ sPump . tion . The cup or basin into which the stream ( part of… … No . 97 . Le Demour ’ s Pump , the next one . [ The vessels under the pump spouts in Nos . 90 , 93 and 94 , are Roman bronze buckets from Pompeii . ] END OF THE SECOND BOOK .
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