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. 1990 May-Jun;95(3):255–290. doi: 10.6028/jres.095.028

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Cross-section of upper mercury manometer cell, showing details of the three-lead capacitance level measurement and the seals. The mercury cup was designed to maintain a stable position independent of pressure, and to be wrung to a gage block at the bottom and to a fused silica mounting disc at the top. Wringing the components of the capacitance level-detection assembly to the fused silica disc minimized the likelihood of drift in the mercury level, as well as deviations from co-planarity between the mercury surface and the capacitor plate. Mercury contacts MC1 and MC2 minimized stress arising from stiffness in the electrical contacts. (Reprinted from reference [5].)