Regnaults Manometer

“AB is a strong metal tube, closed at the lower end, and carrying at the upper a bent pipe for admitting the compressed gas and a stop-cock R pierced with holes in a T form. DE and FG are two graduated glass tubes communicating at their lower ends by a narrow passage in the metal block to which they are hermetically fixed. DE and AB Also communicate at the upper ends by a passage in a metal piece attached bermetically to them. By the stop-cock R’, having radial holes at right angles to each other, DE can communicate either with AB or with the atmosphere at O; and by the stop-cock R’’ it can communicate either with FG or with the open air. The three tubes are surrounded by a cylinder MM’ containing water to keep the temperature constant. The tube AB is filled with the compressed gas whose pressure is to be ascertained. Mercury is poured into FG till it fills DE and runs out at O.” —The Encyclopedia Britannica, 1903

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