Light energy, its physics, physiological action and therapeutic applications (1904)
Cleaves, Margaret Abigail, 1848-1917 · New York, Rebman company;[etc., etc.] · leaf 427
Fig. 12. where the luminous intensity is seen to reach a maximumabout 50° both above and below the horizontal plane. The contrary is true of the luminous intensity of a con-tinuous-current arc, as is shown in the second illustration. *For the detailed history of the case, the author is indebted…
