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MERCURIAL BAROMETER (FORTIN TYPE)
 
MERCURIAL BAROMETER (FORTIN TYPE) (1846)
The Fortin Type Barometer consists of a long glass tube sealed at one end and filled with mercury. The tube is inverted so that the open end is submerged in a cistern of mercury. The height of the mercury in a tube is a mercury of the atmospheric pressure acting on the mercury in the cistern. Reading are taken by first adjusting the mercury level in the cistern to a zero point and then moving a vernier to the top of the mercury column.

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