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Hyp-som′e-ter.

An instrument for measuring hights by observing differences in barometric pressures at different altitudes.

Notably, an instrument for determining altitudes by observation of the boilingpoints of water. It has a watervessel, lamp, and thermometer. The example shows the instrument and the case in which it is packed for transportation on the back of a tourist or attendant.

Wollaston's apparatus for in measuring hights by the temperature of boiling water has a mercurial thermometer with a very large bulb and a stem, which has a length of one inch for every degree of the scale. This is read by a vernier to thousandths. It is found that a difference of barometric pressure of 0.589 inches is equivalent to 1° in the boiling-point, or 530 feet of ascent at moderate elevations.

Tables have been constructed for use with the apparatus, showing the precise elevation corresponding to different temperatures of boiling water.

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F. Wollaston (1)
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