Abstract
BY placing a primary Tesla coil about a highly exhausted pyrex bulb containing metallic sodium, and enclosing the whole in an oven, the writer has obtained a brilliant electrodeless discharge at a temperature in the neighbourhood of 300° C. Observation with a Hilger constant deviation spectroscope revealed, in addition to the D lines, doublets at 6162 (and 6158), at 5688 (and 5683), at 4667, at 4497, as well as faint probable doublets at 5153, at 4980, and at 4572—lines all to be found in the arc spectrum. After two or three hours' continuous heating the discharge was almost as brilliant as initially, although the bulb on removal from the oven had the usual brown colour resulting from the action of the hot vapour.
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ROBERTSON, J. The Electrodeless Discharge in Sodium Vapour. Nature 107, 269 (1921). https://doi.org/10.1038/107269a0
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DOI: https://doi.org/10.1038/107269a0
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