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

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Originally appearing in Volume V14, Page 209 of the 1911 Encyclopedia Britannica.
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HYPSOMETER (Gr. lidos, height, pETpov, a measure) , an See also: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 See also:vessel in which the liquid, usually See also:water, is boiled, surmounted by a jacketed See also:column, in the See also: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 See also:atmosphere.

End of Article: HYPSOMETER (Gr. lidos, height, pETpov, a measure)

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