๐”– Bobbio Scriptorium
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United States government specification for soap powder


Publisher
Elsevier Science
Year
1922
Tongue
English
Weight
124 KB
Volume
194
Category
Article
ISSN
0016-0032

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United States government specification f
๐Ÿ“‚ Article ๐Ÿ“… 1922 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 122 KB

THE arc spectra of neodymium and samarium were photographed with a large concave grating spectrograph, the photographic plates being suitably sensitized to record the spectra from the green to the infra-red. About 1500 lines were measured in each spectrum, most of them being of low intensity. No b