In view of the interest of the subject to phototherapists, in a previous paper data were presented on the ultraviolet component radiation from the carbon and the mercury arc lamps, and from the sun. The data thus summarized1 for the benefit of phototherapists foreshadowed further investigations in this domain.
The present investigation was carried out in cooperation with the Research Laboratory of the National Carbon Company, which provided extensive lamp equipment and a part of the personnel.
In the accompanying table is given a summary of the various samples of material examined.
APPARATUS AND METHODS
In the present section are given some of the essential details of the experimental procedure, and the apparatus used in this investigation in which the measurements were made in duplicate, (1) by mapping the ultraviolet spectrum by means of a quartz spectroradiometer and (2) by measuring the spectral components of the total radiation emitted