Integration of the Planck function over almost any band of wavelengths normally of interest to meteorology is shown now to be practical using modern scientific pocket calculators. A graph of the integral and an example are included.

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1 Editor's Note: We are sorry to report that word of Dr. Widger's death on 4 May 1976 was received while this article was in review for publication.

2 Provided the HP-65, which made this study possible.