In a previous paper1 dealing with a method of testing for pathologic skin reactions to light, a modified carbon arc light source was described. This utilized a Bausch & Lomb mechanical feed arc fitted with a nozzle and a filter holder. A No. 9863 Corning glass filter was used to modify the light. The use of this filter has been justly criticized by Kesten,2 in that it transmits wave lengths as low as 2,537 A. and screens out most of the visible light (Fig. 1). This paper will describe a filter and the modifications of the nozzle to accommodate it, which, when used in combination with the carbon arc, both quantitatively and qualitatively approaches the spectrum of the sun.
There are 2 sources of light from the carbon arc. The first is that from the incandescent core of the carbon. Like any incandescent body, it is a continuous
STARKE JC, JILLSON OF. Duplication of the Sun Spectrum with a Modified Carbon Arc. Arch Dermatol. 1960;82(6):1012–1014. doi:10.1001/archderm.1960.01580060168035
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