The Technic of Measuring Radiation and Convection

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Abstract
The total radiation from the surface of the human body can be determined by means of the Hardy radiometer making due allowance for the effective radiating surface which is smaller than the total surface. The respiration calorimeter of the Russell Sage Institute of Pathology in one set of measurements determines the heat lost in vaporization. By an independent method it gives accurate figures for the heat lost in radiation plus convection. This makes it possible to determine by subtraction the heat loss by convection and to partition the three important channels of heat loss. Inasmuch as calculations are based on heat loss and not heat production the heat storage in the body is not employed in determining partition of heat loss. It can be calculated from the difference in heat production and heat loss. It is believed that the combination of respiration calorimeter and radiometer has provided the first accurate measurement of normal convection loss.

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