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HYPSOMETER (Gr. lidos, height, pETpov...

Online Encyclopedia
Originally appearing in Volume V14, Page 209 of the 1911 Encyclopedia Britannica.
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HYPSOMETER (Gr. lidos, height, pETpov, a measure), an instrument for measuring heights which employs the principles that the boiling-point of a liquid is lowered by diminishing the pressure, and that the barometric pressure varies with the height of the point of observation. The instrument consists of a cylindrical vessel in which the liquid, usually water, is boiled, surmounted by a jacketed column, in the outer partitions of which the vapour circulates, while in the central one a thermometer is placed. To deduce the height of the station from the observed boiling-point, it is necessary to know the relation existing between the boiling-point and pressure, and also between the pressure and height of the atmosphere.
End of Article: HYPSOMETER (Gr. lidos, height, pETpov, a measure)
HYPOTRACHELIUM (Gr. vaorpaxi7Awv, the lower part of...

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