The measurement of the monochromatic emittance of thermal insulators at temperatures near room temperature is discussed. Results for the spectral emittance of freeze-dried beef are presented. For temperatures between 115 F and 125 deg F, the emittance is between 0.7 and 0.85. These values compare favorably with existing total emittance data. A discussion of the error involved in making such measurements is discussed in detail.

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