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The principle of a 4 pi radiometer, enclosing a source of radiation in a black body is introduced for the measurement of total radiated heat output from irregular bodies. For the actual construction of a black body radiometer, special thermoelectric surface receivers were designed and built. Their essential characteristics are: stability against air movement obtained without shields or windows; stability against thermal disturbances; and, rapid response combined with rugged construction. Although the instrument is specifically developed for continuous recording of radiant heat loss and average skin temperature in studies on reflex temperature control of the human body, the general principle of the black body radiometer, or the special design of the receiver, may have other applications, in physics, meteorology, or engineering.