Identifier: rntgenrayselectr00kass (find matches)
Title: Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy
Year: 1910 (1910s)
Authors: Kassabian, Mihran Krikor, 1870-1910
Subjects: Electrotherapeutics X-rays Phototherapy Radiology Radiotherapy
Publisher: Philadelphia & London : J.B. Lippincott Company
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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try Piffard, William J.Morton, Dieffenbach, EoUin H. Stevens, and many others report favorableresults from radium therapy. ^ Archives of the Eontgen Ray, September, 1905. 2 British Journal of Dermatology, December, 1904 ; Treatment, A^jril, 1905. CHAPTER VII PHOTOTHERAPY. In order to grasp the principles involved in the study of photo-therapy, it is necessary to understand the more simple elementary factsconcerning the physics of light and the spectrum. Regarding the nature of light, two theories have been advanced.Newton asserted that luminous bodies emitted infinitely small particlesin parallel lines, which produced in the eye the sensation of light.Huyghens, whose view now generally obtains, formulated the theory thatlight is produced by waves or undulations, that are transmitted withinconceivable velocity through the atmospheric ether. All light, whether natural, as that from the sun and other celestialbodies, or artificial,—i.e., the electric spark or ordinary flames,—is of a
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Fig. 241.—Solar Specteum.—Scheme of the wave lengths of different radiations. A B C is thecurve of thermal action ; D E F G is the curve of chemical action ; EC I K is the curve of light action,with a maximum at yellow. compound nature. If a ray of sunlight be suffered to fall upon a glassprism, it is diverted from its original direction, and, as its constituentcolors are bent unequally, they are separated. When the transmitted lightfalls upon a white surface, the colors become visible, the tints blendingwhere one color merges into another. This zone of blended tints is calledthe spectrum. The colors seen are violet, indigo, blue, green, yellow,orange, and red. According to the undulatory theory of light, each of these constitu-ent colors has its own rate of vibration. Red has the lowest and vio-let the highest rate of vibration; the former is least refracted or retarded 5the latter undergoes most refraction or retardation. Different colors have510 PHOTOTHEEAPY. 511 different wave

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