Question

What is Fortin barometer???
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Answer 1

Fortin barometer A mercury barometer that requires the accurate setting of the mercury level at a fixed point (scale zero, see fiducial point). The reading of the mercury height is then taken by adjusting a vernier scale to the top of the mercury column. ... See also Kew barometer.

Answer 2

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$\bf{\underline\red{Fortin-barometer }}$

• A portable mercury barometer that was invented in 1800 by the French instrument maker Jean Nicholas Fortin (1750–1831). In other mercury barometers air pressure is calculated from the distance between the level of the mercury in the reservoir and in the tube.

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