Heat Stress Thermometer

Botsball Thermometer
DESCRIPTION: The BOTSBALL Thermometer consists of a 2 3/8 inch hollow copper sphere that is painted black and covered with a double layer of black cloth. The cloth covering is continuously moistened by water seeping from the aluminum reservoir tube attached. The stem of a dial thermometer passes along the center line of the water reservoir tube and into the globe to sense its temperature.

OPERATION: When the BOTSBALL Thermometer is placed in a hot area, the globe is warmed by the surrounding air and by heat radiated from hot surfaces. It is also cooled by evaporation according to the wind and humidity. After about 5 minutes, the BOTSBALL Thermometer reaches an equilibrium temperature which provides a direct physical measure of the thermal environment.

USES: Any change in air temperature, humidity, wind or thermal radiation that causes the BOTSBALL Temperature to rise will increase human discomfort or stress. Conversely, any change in these conditions that lowers the BOTSBALL Temperature will alleviate discomfort or stress. Thus, 'the BOTSBALL Temperature provides an excellent index of human responses to heat.

Occupational heat exposure limits have been proposed by the American Conference of Governmental Industrial Hygienists and the National Institute for Occupational Safety and Health. The U. S. Department of Labor will issue heat exposure regulations under the provisions of the Occupational Safety and Health Act. The BOTSBALL Thermometer can be used to determine quickly which work environments may exceed these limits.

If the BOTSBALL Thermometer is to be used in magnetic fields strong enough to attract a steel tool held in the hand with noticeable force, a slight error in the indication of the dial thermometer might result. For such applications, the BOTSBALL Thermometers with magnetic shielding should be used.


Model Geo-80 Botsball Thermometer in Degrees F
Model Geo-85 Botsball Thermometer in Degrees F, c/w magnetic shielding
Model Geo-90 Botsball Thermometer in Degrees C
Model Geo-92 Botsball Thermometer in Degrees C, c/w magnetic shielding

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