constant intensity of the source and constant gain in the amplifier.Still greater sensitivities could be obtained by using a dispersive optical system and optical null-balancing techniques; but these refinements would make maintenance more difficult, and do not appear to be required for the intended applications.
CONCLUSIONSTraces of nitrogen may readily be detected in the spectrum of gaseous argon excited by an electrodeless discharge.A silent electric discharge operating at 1-atm. pressure was found to be the most satisfactory source. The nitrogen is determined by measuring the intensity of the 3371 A. band head of the second positive system.
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