Open AccessThe carbon arc spectrum in the extreme ultra-violet.— II
Publication year - 1923
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1923.0115
Subject(s) - grating , arc (geometry) , radius of curvature , radius , wavelength , optics , spectrum (functional analysis) , carbon arc welding , line (geometry) , carbon fibers , curvature , physics , broad spectrum , millimeter , materials science , computer science , mathematics , chemistry , geometry , laser , mean curvature , computer security , mean curvature flow , quantum mechanics , shielding gas , laser beam welding , composite number , composite material , combinatorial chemistry
In a recent paper I have given measurements of some lines in the carbon arc spectrum in the Lyman region which had not previously been photographed. Further work has enabled me to photograph many more lines in this spectrum, and to record shorter wave-lengths in an arc spectrum than any previous worker with this source. The apparatus used was precisely similar to that described in the previous paper, except in respect of the grating. Several fresh gratings have been tried, including some ruled at Johns Hopkins University and others ruled on the Blythswood engine at the National Physical Laboratory. It was with one of the latter alone that it was possible to record any lines of shorter wavelength than those given in the previous paper, and with this grating the measuremerits were made. It was ruled on a 7 cms.-plate of 100 cms. radius of curvature, with a ruled area of 5·0 cms. X 3·6 cms., and had 568 lines per millimetre.