Mathematics – Probability
Scientific paper
Jan 1896
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1896natur..53..245r&link_type=abstract
Nature, Volume 53, Issue 1368, pp. 245 (1896).
Mathematics
Probability
Scientific paper
IN his investigation on the spectrum of helium1, Crookes has examined the spectrum of five different samples of gas, two being developed from cleveite (No. 1 and No. 5), another from uraninite (No. 2), and two from bröggerite (No. 3 and No. 4). Sample No. 5 has been prepared with special care, and is designated ``helium purissimum.'' The five spectra are by no means identical, and it has been concluded that besides helium there are other gases present. E. A. Hill2 has even gone so far as to infer the existence of at least fifteen new elements from the comparison of these five spectra. Thirty of the seventy-nine wave-lengths measured by Crookes coincide (within the limits of error) with wave-lengths that we have measured in the spectrum of cleveite gas.3 But the remaining forty-nine lines, many of which are strong, do not coincide with any of ours. As far as we know, it has not been noticed that thirty-three of these forty-nine lines almost certainly belong to argon, among them nearly all the stronger lines. Six more may also be argon lines, but the identification is rather doubtful. Two lines in all probability are mercury lines, which naturally are likely to appear in a vacuum-tube made by means of a mercury pump. One line may be due to carbon. The table on p. 246 contains a list of the forty-nine wave-lengths that do not coincide with wave-lengths that we ascribe to helium, and gives their probable origin. The wave-lengths of argon lines are taken from Kayser (Chemical News, August 30, 1895), Eder and Valenta (Ber. der Wiener Akad., October 24, 1895), and from Crookes' own measurements.
Paschen Friedrich
Runge Carl
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