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the Week of Proper 25 / Ordinary 30
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Bible Encyclopedias
Hypsometer

1911 Encyclopedia Britannica

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(Gr. 40s, height, Air pov, 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.

Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Hypsometer'. 1911 Encyclopedia Britanica. https://www.studylight.org/​encyclopedias/​eng/​bri/​h/hypsometer.html. 1910.
 
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