Katathermometer: Difference between revisions
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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]].<br/> 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|cooling power]]. | |||
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Latest revision as of 12:01, 26 March 2024
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.
