Light energy, its physics, physiological action and therapeutic applications (1904)
Cleaves, Margaret Abigail, 1848-1917 · New York, Rebman company;[etc., etc.] · leaf 514
ng at the same time as a reflector. This ismost important, for, as has been noted, the chemical rayshave short wave lengths and high frequencies, and can agi-tate little things in their path, such as molecules, and as thisagitation is what is assumed to effect chemical change, it ismost important… … Fig. 19.—Victor Lamp. Fig. 20.—Lortet et Genoud Lamp. 474 LIGHT ENERGY. an exposure of from 15 to 20 minutes suffices against anhour and a quarter with the Finsen tube. This is due to thesecuring of a residual beam of much greater total energythan is obtained from a tube with condensing lenses…
