Measurements are made of the intensity distribution in the continuous emis- sion band, appearing at the 1 2 S series limit of caesium, using a low voltage ther- mionic discharge in the vapor as a source. The wave-length range covered lies between the series limit 3,184 A and about 2,750 A. The methods of photo- graphic densitometry are employed and a tungsten strip lamp in quarti is used as a comparison source.
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C. Boeckner (1931) studied this question.