File:A manual of practical medical electricity - the Röntgen rays and Finsen light (1902) (14803575253).jpg

Identifier: manualofpractica00turn (find matches)
Title: A manual of practical medical electricity : the Röntgen rays and Finsen light
Year: 1902 (1900s)
Authors: Turner, Dawson
Subjects: X-Rays Electrophysiology Electrosurgery Electric Stimulation Therapy Electrotherapeutics X-rays Electrophysiology Electrosurgery
Publisher: New York : William Wood & Company
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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as been associated with the red-light treatment of small-pox and the ultra-violet lighttreatment of skin diseases. It is with the latter that weare now concerned (refer to p. 147). Production of the Ultra-Violet Rays. They are found naturally in sunlight. They may beartificially produced chiefly in two ways : (a) By an electric arc light. (&) By an electric spark from a condenser. Doubtless they are present to a varying extent in othersources of illumination, but are either deficient in quantity 362 A Manual of Practical Medical Electricity or are cut off by some opaque substance, such as by the glassof a Rontgen ray tube. Probably other powerful sourcesof ultra-violet radiation will be found. I made some.experiments with burning magnesium wire, but was dis-appointed with the result. The sunlight cannot often bemade use of in our climate, and there are two disadvan-tages which attend it: one, that it is also such a powerfulsource of radiant heat, which must in some way be filtered
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Fig. 167.—Condenser Spark Lamp. off; and, secondly, that mucli of its ultra-violet radiationis absorbed in passing through our atmosphere. (a) The arc light with carbon electrodes gives off blueand violet rays freely and ultra-violet in fair amount ; ifprovided with iron electrodes, the emission of the ultra-violet is increased, but it labours also under the disadvan-tage of being a copious source of radiant heat. Meansmust be taken, then, both in its case, and in that of the sun, Ultra-Violet Rays 363 to remove, by some cooling medium or substance opaqueto radiant heat, the excessive heat rays, which would other-wise cauterize the part. (6) It has long been known that the electric spark pro-duced by the discharge of a condenser was of a brilliantcharacter, and that it had strong actinic qualities, butDr. Gorl of Nuremberg was the first person, so far as Iam aware, to make use of it therapeutically (Milnch.Med. Wochenschrift, No. ig, 1901). This spark is obtained (see p. 147) by con

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