A Precision Differential Manometer

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Abstract
The requirements imposed by investigations of flow and heat transfer characteristics of low density gases have been met by developing a precision manometer for measuring pressures in the range from approximately 0.05 mm Hg to 20 mm Hg. The instrument makes use of optical elements to allow the observer to view a clear magnified image of the meniscus. Precision lead screws and gearing control the movement of the optical viewing systems, and together with a mechanical differential indicate the differential height on a counter directly in thousandths of an inch. The instrument employing a low vapor pressure oil can be operated and read rapidly, and the reproducibility of its readings by different observers is half its least count, or 0.001 mm Hg.

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