Question

What is fortin barometer ?

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. The barometer was invented early in the nineteenth century by Jean Fortin. See also Kew barometer.

Answer 2

Fortin barometer is a mercury Barometer