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Durand, Loyal, Jr. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XXXI (1938)

James, Harry Raymond; Birge, Edward A.
A laboratory study of the absorption of light by lake waters,   pp. [1]-154 PDF (46.6 MB)


Page 26

70 
C 
4000 
 5000 6000 7000 8000 
 26 Wisconsin Academy of Sciences, Arts, and Letters 
 FIG. 3. Curves showing the percentage of radiation absorbed by one meter
of distilled water, as determined by various observers. Only 4 curves are
plotted, in order to avoid confusion. For details and for other curves see
Figs. 4, 5, 6. The main curve (J) shows absorption as found by the present
report; it is lower than other recent work in the region 8000-7500 A, higher
at 7000-6000 A, and lower again at 5000-4000 A. These results agree with
those of Aschkinass (As), 7000-8000 A, so closely that much of the latter
curve cannot be plotted; the curves diverge widely, 6500-7000 A. Sawyer's
curve (5) begins at 6500 A, where it has absorption lower than any other
observer; in the violet Sawyer's results are higher than others. For high
absorption in the long wave region the curve of Collins is plotted, since
it shows the greatest absorption to 7000 A. 


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