Cistern barometer:
A mercury barometer in which the lower mercury surface is larger in area than the upper surface. The basic construction of a cistern barometer is as follows: A glass tube one meter in length, sealed at one end is filled with mercury, and then inverted. The tube is mounted so that its mount penetrates the upper surface of a reservoir of mercury called the cistern of the barometer. See Fortin barometer, Kew barometer.
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