A Wet Globe Thermometer for Environmental Heat Measurement

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Abstract
The Wet Globe Thermometer consists of a dial thermometer with the heat sensing portion enclosed by a blackened copper sphere that is completely covered with wet black cloth. The wet globe exchanges heat with the surroundings by conduction, convection, evaporation and radiation similar to the way a perspiring man does so the equilibrium temperature of the globe provides a comprehensive measure of the cooling capacity of the work environment. This Wet Globe Temperature correlates so well with the more complicated environmental heat ratings calculated from air temperature, velocity, humidity and thermal radiation that it may be substituted for them.

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