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A single thermometer wet bulb globe temperature (WBGT) index meter

L A Kuehn, R A Stubbs and L E MacHattie

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A new instrument is described in which the readings of a single mercury-in-glass thermometer approximate to the wet bulb globe temperature index and therefore serve as a useful measure of the total heat stress imposed on man by his thermal environment. The thermometer bulb is located at the centre of a hollow blackened copper sphere which is covered by a moistened fabric jacket. Of several versions differing in jacket geometry, the most promising agrees with the WBGT index to within 1 degF in the range 70-90 degrees F WBGT for relative humidities ranging from 50 to 90%.


PACS

07.20.Dt Thermometers

06.20.fb Standards and calibration

Subjects

Instrumentation and measurement

Dates

Issue 4 (April 1971)



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