Light energy, its physics, physiological action and therapeutic applications (1904)
Cleaves, Margaret Abigail, 1848-1917 · New York, Rebman company;[etc., etc.] · leaf 474
Throughthis a current of cold water was kept constantly passing.Because of the prolonged exposures necessary with con-densed sunlight in the treatment of organized skin condi-tions, the solution in this second lens also becomes hot. W. H. Dalphe1 states that with this second heat filter, he W. H.… … Fig. 15.—Sun Lens. CONCENTRATED SOLAR ENERGY. 439 has been obliged to interrupt his sittings and that throughit he could set fire to paper or cotton goods in a very shorttime. Methylene blue is sometimes used in the large hollowcondensing sun lens as a filter of the longer slower frequen-cies below…
