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.

  • 1
    $\begingroup$ This article is a good place to start. $\endgroup$ – Fred Jan 22 at 3:50
  • 1
    $\begingroup$ 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

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.