A Sensitive Mercury Manometer

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Abstract
A mercury manometer, of the U tube type, in which the volume of mercury which flows between the arms when a pressure is applied can be measured precisely, is described. The arms of the U tube are made in the form of large diameter, shallow cylinders to give a large flow of mercury for a relatively small pressure change. The flow is measured by determining changes in the volume of mercury in one arm of the manometer. This is done by isolating that arm through the closure of a stopcock contained in the small bore tubing which connects the two arms, and adjusting the level of the mercury to an etch in a capillary; the volume change is then read directly from the position of the end of the mercury thread in a second capillary. The magnification of a pressure change is one‐half the ratio of the cross‐sectional areas of the U tube cylinder and the capillary on which the volume change is noted. Magnifications as high as 4000 have been obtained with this device.

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