A cylindrical black-body cavity is described, which will operate up to 1100°C, made of stainless steel 15 cm long and 6 cm in diameter and with a working aperture 3 cm in diameter. Internal baffles and grooved surfaces are used to attain an emissivity of 0.997 while keeping the dimensions of the cavity small. The mounting of the cavity in a horizontal Nichrome-wound furnace is also described along with experiments which confirm that the emissivity is as high as 0.997.
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T J Quinn (1967) studied this question.
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