DURING the past twelve years there have been six investigations of the spectral transmission of light through fog, mist, or liaze carried out in the United States. The conditions of the tests have been varied. Three of the researches were made with fog chambers; three with natural fogs. One was made with a path of only 1·9 m. (6·2 ft.); the longest path was 1,200 m. (3,900 ft.). One of the fogs was so light that a 1,000,000 candle‐power airway beacon could be seen 13 km. (8 miles); the densest would permit such a beacon to be seen only 0·03 km. (0·02 mile). One investigator scarcely covered the entire visible spectrum. Two included the infra‐red as far as 3·0 microns and 2·5 microns respectively, and the latter of these extended his work as far as 0·324 micron in the ultra‐violet. It is not surprising that curves based on data taken under such diverse conditions should show little resemblance to one another.
Breckenridge, F.G. (1931), "Transmission of Light through Fog: An Attempt to Correlate the Results of Six Investigations Made in U.S.A. in Recent Years", Aircraft Engineering and Aerospace Technology, Vol. 3 No. 10, pp. 261-264. https://doi.org/10.1108/eb029464
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