London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 224
d on throughthe centre of the inner cylinder; and, further, that when thelatter is again brought into contact with the lower seat {b b), andat the same time (by our premises) with the upper seat (c c), allpassage through is closed. This being understood, it is obviousthat we have here got a valve… … now consider the relations that will be found between a valveso made, and an ordinary lifting, or spindle, valve; and af-terwards, a sliding, or draw, sluice, when exposed to staticalpressure. Calling, then, A =: the area of any surface exposed to fluid pressure; D = the depth of its centre of…
Architecture
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