A manual of practical medical electricity : the Röntgen rays and Finsen light . 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 Pra
A manual of practical medical electricity : the Röntgen rays and Finsen light . 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 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. 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.
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