Fortin barometer

Fortin barometer

[′fȯrd·ən bə′räm·əd·ər]
(engineering)
A type of cistern barometer; provision is made to increase or decrease the volume of the cistern so that when a pressure change occurs, the level of the cistern can be maintained at the zero of the barometer scale (the ivory point).
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References in periodicals archive ?
In the late 18th and early 19th centuries the manufacture of barometers and other scientific instruments, especially for instruments for use in the shipping industry, boomed in both Liverpool and Manchester - there were mercury wheel barometers, stick barometers and Fortin barometers.
Fortin barometers, commonly referred to as marine barometers, are interesting as the design allows the mercury to measure accurately despite constant movement.