A descriptive and historical account of hydraulic and other machines for raising water (1842)
Ewbank, Thomas · Tilt & Bogue · leaf 310
angular pieces of stout metal , and are dropped into slits made through the rim of the drum , their length being equal to that of the case , and their width to the distance between its rim and the D piece . They are moved by a crank attached to the drum axle . To lessen the friction and compensate… … No . 137 . N ' o . 138 . In No . 138 the axis of the drum or smaller cylinder is so placed as to cause its periphery to rub against the inner circumference of the case . ' Two rectangular pistons , whose length are equal to the internal diame - ter of the case , cross each other at right angles ,…
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