The incidence of heat casualties among recruits at a training center has been reduced appreciably since 1953 by limiting certain activities during periods of excessive heat. To avoid undue loss of time from programs of drill and physical conditioning, a closer adaptation of such activities to weather conditions was needed. An older index based on temperature and humidity alone was replaced by an index (WBGT) based on temperatures read with a shaded dry bulb thermometer, a shaded wet bulb thermometer, and a "globe" consisting of a thermometer enclosed within an unshaded, blackened 6-in. copper sphere. The closer adjustment of the training program to weather resulted in a further significant reduction of heat casualties in the summer of 1956, although it was hotter than the summer of 1955.
Minard D, Belding HS, Kingston JR. PREVENTION OF HEAT CASUALTIES. JAMA. 1957;165(14):1813–1818. doi:10.1001/jama.1957.02980320043010
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