The method of treating patients for tuberculosis of the larynx with the sun's rays was introduced in 1904 by Sorgo1 of Davos, Switzerland, who devised a system of mirrors for reflecting the rays into the larynx. Ten years later, Phillip2 improved Sorgo's method by using a concave mirror reflector instead of Sorgo's plain mirror.
PHYSICAL PROPERTIES AND THERAPEUTIC ACTION OF LIGHT
The scientific study of the physical properties and therapeutic action of the sun's rays and artificial ultraviolet light was carried out by many authors, and the following is a short summary of their observations.Sunlight contains the shorter ultraviolet rays, the visible light and the invisible infra-red rays. The shorter ultraviolet rays are found only in small quantities at sea level. The mercury quartz light contains an abundance of these short ultraviolet rays. Seventy per cent of the radiation emitted by the mercury vapor light consists of
KATZ B. ULTRAVIOLET LIGHT IN TUBERCULOSIS OF THE LARYNX. Arch Otolaryngol. 1931;14(1):9–15. doi:10.1001/archotol.1931.03580020017002
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