Light therapeutics; a practical manual of phototherapy for the student and the practitioner : with special reference to the incandescent electric-light bath.

  • Kellogg, John Harvey, 1852-1943.
Date:
1910
Catalogue details

Licence: Public Domain Mark

Credit: Light therapeutics; a practical manual of phototherapy for the student and the practitioner : with special reference to the incandescent electric-light bath. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    ing company for a few cents a pair. Projector carbons, such as are used for stereopticons, are of especially fine quality. COLORED SCREENS Colored glass permits the passage only of rays of its own color, absorbing other rays; that is, blue glass per- mits the passage of blue and violet rays, but excludes the red, yellow and other rays, including most of the lumi- nous heat rays. The red or yellow screen in the same way excludes the actinic rays, permitting the passage of the luminous heat rays. Ordinary glass of any sort ab- sorbs most of the ultra-violet rays, which are invisible. Quartz glass alone permits the passage of the ultra-violet rays. The blue screen is useful in cases in which it is desirable to obtain the effects of the actinic rays without the heat rays. The red screen is used when the effect of the luminous heat rays is desired without the actinic rays. For most cases the light of the electric arc may be used to best advantage without screens. ELECTRIC FUSES The purpose of the fuse is to prevent the passage of so great an amount of current as to injure the apparatus or do other harm. The fuse consists of a short piece of metal which readily melts when heated. For the Solar Therapeutic Lamp a ten-ampere fuse is employed at the lamp, while a fifteen-ampere fuse should be used at the meter of the same circuit. In installing care should be taken to see that the fuse of the circuit in which the lamp is placed is of sufficient capacity to furnish the required amount of current.