A descriptive and historical account of hydraulic and other machines for raising water (1842)
Ewbank, Thomas · Tilt & Bogue · leaf 308
acting as butments , are made to perform the part of pistons ; this is done by hinging them on the rim of the drum , of which , when closed , they also form a part : they are closed by passing under a permanent projecting piece or butment that extends from the case to the drum . In No . 134 the… … Century , and probably was known much No . 134 . iiotary Pump of the I6th earlier . Besides the defects common to ceiltury ' most of its species , it has one peculiar to itself : — as the butment must be loaded with weights sufßcient to overcome the pressure of the liquid column over the valve , (…
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