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1This is a composite report of the radiation discussion by F. A. Brooks at the Toronto joint meeting of the Royal and American Meteorological Societies, August 28, 1939 and of the paper:—“Some measurements of nocturnal radiation”, by Lorenzen, Brooks and Boelter given at Stanford, California Meeting of the American Meteorological Society, June 24, 1939, excepting detail discussion of radiometric theory. The complete original Stanford paper is available from the Secretary, American Meteorological Society, Blue Hill Observatory, Milton, Mass.

2Agricultural Engineer in the Experiment Station, University of California, Davis. Calif.

3Associate in Agricultural Engineering, University of California, Davis, Calif.

4Professor of Mechanical Engineering, University of California, Berkeley, Calif.

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