. Light energy, its physics, physiological action and therapeutic applications . render the rays parallel; s, lenses to render the raysconvergent. supply the needed apparatus for the utilization of the intensechemical frequencies of light energy from an electric first therapeutic applications were made with concen-trated sunlight, but it was not possible to obtain in that waysufficient energy, and, moreover, in northern latitudes, asthat of Denmark, the sun was not always in evidence. Finsens Concentrator.—Finsens apparatus consists of atelescopic tube, by means of which the divergent
. Light energy, its physics, physiological action and therapeutic applications . render the rays parallel; s, lenses to render the raysconvergent. supply the needed apparatus for the utilization of the intensechemical frequencies of light energy from an electric first therapeutic applications were made with concen-trated sunlight, but it was not possible to obtain in that waysufficient energy, and, moreover, in northern latitudes, asthat of Denmark, the sun was not always in evidence. Finsens Concentrator.—Finsens apparatus consists of atelescopic tube, by means of which the divergent rays of anelectric arc are collected into parallel rays. These parallelrays are then collected into a cone, the apex of which is aQuoted by Freund. CONCENTRATED ELECTRIC ARC LIGHT ENERGY. 467 allowed to fall upon the part of the skin to be 16 gives a diagrammatic cut of Finsen tube. Thistube, which is the connecting apparatus between the sourceof light energy and the patient, consists of 2 metal cylinderstelescoped one into the other, each one of which contains. -Finsen two plano-convex lenses of quartz. These two parts of theapparatus may be separated by a rack and pinion various lenses are so proportioned as to size that 1 and 2have together a focal distance of 12 cm., while 3 and 4 havea focal distance of 10 cm. By the lenses 1 and 2 nearest to the source of light, thedivergent rays of the electric arc are gathered into a bundleof parallel rays; then by the action of the lenses at 3 and 4these parallel rays converge on the surface to be is about 10 cm. outside of the lens marked 4. In the From Freund, Radiotherapy and Philotherapy. 468 LIGHT ENERGY. original tube the water chamber was fixed between lenses3 and 4, and kept filled with distilled water for the purposeof absorbing the thermal frequencies: This part of thecylinder is in turn surrounded by an additional chamberthrough which, by an afferent and an efferent system
Size: 1690px × 1478px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishere, booksubjectlight
