Abstract
WITH reference to the interesting letter by S. Ratner on the electric are in high vacuum, published in NATURE of Oct. 15, p. 548, this type of arc has been observed previously by me under conditions very similar to those used by the author (see Phil. Mag., vol. 2, p. 796; 1926). I found that it could be excited in residual gases or in hydrogen at very low pressures, provided that an initial electrical discharge was sent between one of the iron electrodes and a third electrode.
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NEWMAN, F. The Electric Arc in High Vacuum. Nature 120, 695 (1927). https://doi.org/10.1038/120695b0
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DOI: https://doi.org/10.1038/120695b0
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