HYPSOMETER (Gr. lidos, height, pETpov, a measure)

This article appears in Volume V14, Page 209 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: HOR-I25

HYPSOMETER (Gr. lidos, height, pETpov, a measure) , an

instrument

INSTRUMENT (Lat. instrumentum, from insincere, to build up, furnish, arrange, prepare)

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

INSTRUMENT (Lat. instrumentum, from insincere, to build up, furnish, arrange, prepare)

consists of a cylindrical

vessel

VESSEL (O. Fr. vaissel, from a rare Lat. vascellum, dim. of vas,
vase
- VASE
- VASE (through Fr. from Lat. vas, a vessel, pl.
  vasa
  - VASA, or NIKOLAISTAD
  , of which the singular vasum is rarely found; the ultimate
  root
  - ROOT (late O.E. rot, adopted from Scand., cf. Norw. and Swed. rot, Dan. rod; the true O.E. word was wyrt, plant, represented in Ger. Wurz or Wurzel; the ultimate root is the same in both words, and is seen in Lat. radix)
  - ROOT, ELIHU (1845– )
  is probably was-, to
  cover
  - COVER (from the Fr. convert, from couvrir, to cover, Lat. cooperire)
  , seen in Lat: vestis, clothing, Eng. " vest," Gr. to-th c, and also in " wear," of garments)
, urn)

in which the liquid, usually

water

WATER

, is boiled, surmounted by a jacketed

column

COLUMN (Lat. columna)

, in the

outer

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

ATMOSPHERE (Gr. fir µ6r, vapour; orkaipa, a sphere)

.

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