Difference between revisions of "Katathermometer"

From Glossary of Meteorology
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<div class="definition"><div class="short_definition">A type of [[cooling-power anemometer]] based upon the principle that the [[time  constant]] of a [[thermometer]] is a function of its [[ventilation]].</div><br/> <div class="paragraph">The form developed in the early nineteenth century consisted of a [[liquid-in-glass thermometer]]  having two [[calibration]] markers on the stem corresponding to 38.5&#x000b0; and 35&#x000b0;C. The thermometer  was heated to 40&#x000b0;C, and the time required for the column to fall from 38&#x000b0; to 35&#x000b0;C was measured  by a stopwatch and used to compute the [[wind speed]]. It was especially useful for very low wind  speeds. The katathermometer was used also, in [[human bioclimatology]], to determine [[cooling  power]].</div><br/> </div>
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<div class="definition"><div class="short_definition">A type of [[cooling-power anemometer]] based upon the principle that the [[time constant|time  constant]] of a [[thermometer]] is a function of its [[ventilation]].</div><br/> <div class="paragraph">The form developed in the early nineteenth century consisted of a [[liquid-in-glass thermometer]]  having two [[calibration]] markers on the stem corresponding to 38.5&#x000b0; and 35&#x000b0;C. The thermometer  was heated to 40&#x000b0;C, and the time required for the column to fall from 38&#x000b0; to 35&#x000b0;C was measured  by a stopwatch and used to compute the [[wind speed]]. It was especially useful for very low wind  speeds. The katathermometer was used also, in [[human bioclimatology]], to determine [[cooling power|cooling  power]].</div><br/> </div>
 
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Latest revision as of 17:17, 25 April 2012



katathermometer

A type of cooling-power anemometer based upon the principle that the time constant of a thermometer is a function of its ventilation.

The form developed in the early nineteenth century consisted of a liquid-in-glass thermometer having two calibration markers on the stem corresponding to 38.5° and 35°C. The thermometer was heated to 40°C, and the time required for the column to fall from 38° to 35°C was measured by a stopwatch and used to compute the wind speed. It was especially useful for very low wind speeds. The katathermometer was used also, in human bioclimatology, to determine cooling power.