A mercury barometer with its lower end in a reservoir exposed to atmospheric pressure. A fixed-cistern scale must allow for the changing reservoir level, while an adjustable cistern can restore a fixed lower reference before each reading.
An adjustable-cistern barometer associated with Jean Nicolas Fortin. Restoring the cistern surface to a fixed index makes the lower mercury level reproducible before the upper level is read.[ref]

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  1. Mercury barometer
  2. Barometer
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