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Bar-o-met′ri-cal a-eri-om′e-ter.


Meteorology.) An inverted siphon used for approximately determining the relative specific gravities of immiscible fluids, as oil and water, or water and mercury. For instance, if mercury be poured in one limb and water into the other, and the stop-cock at c be turned so as to establish a communication between them, it will be found that an inch of mercury in one limb will balance 13 1/2 inches of water in the other, showing the relative specific gravities of the two fluids to be as 13 1/2 to one.

Barometrical aeriometer.

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