Katathermometer
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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.

FK Reading Ease
43.5

FK Grade Level
College
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