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This answer to How are barometric pressure measurements traceable over centuries to 100 parts per million accuracy? describes a floating mercury barometer, and mentions that some employed a Vernier scale for additional precision.

Since mercury is so dense (about 13.5 g/cm3) that many metals will float in it, but I'm having a hard time imagining how to make a barometer using his principle, and how a scale (Vernier or otherwise) is used to read the height of an object floating in mercury in order to determine barometric pressure.

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    $\begingroup$ This article is a good place to start. $\endgroup$ – Fred Jan 22 at 3:50
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    $\begingroup$ Everything you wanted to know about mercury barometers & manometers from the National Bureau of Standards, 1960. All 68 pages of it. $\endgroup$ – Fred Jan 22 at 4:33
  • $\begingroup$ @Fred These are really interesting end enjoyable resources; excellent×2! $\endgroup$ – uhoh Jan 23 at 0:44

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