Modifications to an existing vacuum emissometer are described that allow mathematical elimination of reflecting errors of the specimen- window-specimen-detector type. Normal total emittance in the range 20 deg to 600 deg c can be determined. Successive radiance readings ls and ls' are obtained using alternate full- and reduced-size apertures. A separate run on a blackbody crucible allows determination of the corresponding lbb and lbb' values at the same temperature. The equation for true emittance is shown to be e = ls - ls' / lbb - lbb'.
D. K. Deardorff, U. S. Department of the Interior, Bureau of Mines, Albany, Oregon 97321
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