Abstract
WHERE the height of a liquid surface needs to be measured accurately, it is customary to use a needle height-gauge. In a typical gauge a needle point is slowly lowered by a micrometer screw until the point just touches the liquid surface. The instant of contact is detected either visually or electrically, and the micrometer reading at that instant gives the height of the liquid surface. Such gauges are regarded as accurate to within ± 0.001 in. It has been found, however, that with a non-conducting liquid that has become electrically charged, errors of 0.025 in. can easily occur.
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HAYWARD, A. Electrostatic Attraction between a Liquid Surface and a Needle Height-Gauge. Nature 188, 927 (1960). https://doi.org/10.1038/188927a0
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DOI: https://doi.org/10.1038/188927a0
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