Abstract
During the examination of the radiation from the discharge of a high-frequency torch, spectra were recorded with a reduced image of the discharge projected on the slit of the spectrograph. In these conditions portions of the spectrum show skew lines and bands, not continuous with the rest of the image of the slit. This effect is examined; and found to be caused by the obliquity of the incident rays on the principal section of the prism. The effect is explained; and it is pointed out that it can be eliminated when it is desired to study radiation from different parts of the arc by projecting an image of the source on an intermediate diaphragm; and then using another lens to project the light from this diaphragm so that the image of the first lens is in the plane of the slit.
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