There is scarcely any physical agent used by dermatologists that has suffered more vicissitudes than the ultraviolet ray lamp, since Finsen more than thirty years ago successfully cured a patient with tuberculosis of the skin with ultraviolet irradiation. As stated by MacKee1: "There is hardly a skin disease or condition for which some physician has not failed to claim good results with ultraviolet radiation." On the other hand, he said: "With few exceptions the evaluation of ultraviolet radiation is based on an uncertain foundation— clinical observation, impressions, lack of standard dosage and the use of heterogeneous radiation."
The majority of dermatologists in this country employ air-cooled quartz mercury vapor arc lamps for the irradiation of large surfaces and water-cooled quartz mercury vapor arc lamps for special purposes. The former are chiefly of the type that burn at 1,000 F., with the production of heat by long wavelength and high
WRIGHT CS. THERAPY WITH THE COLD QUARTZ LAMP IN DERMATOLOGY: A PRELIMINARY STUDY OF THERAPEUTIC EFFECT AND DOSAGE. Arch Derm Syphilol. 1935;31(3):374–386. doi:10.1001/archderm.1935.01460210085010
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