Open AccessOn some mineral constituents of a dusty atmosphere
Author(s) -
Walter Noel Hartley
Publication year - 1911
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.1911.0039
Subject(s) - cadmium , spectrograph , atmosphere (unit) , mineral , copper , quartz , spectral line , potassium , chemistry , materials science , metallurgy , mineralogy , physics , meteorology , astronomy
During the past 12 months I have had occasion to ascertain the nature of the mineral constituents of an ordinarily turbid atmosphere. By means of a small portable quartz spectrograph several series of spark spectra were photographed with graduated exposures of 1, 5, 10, 20, 40, and 60 seconds, all on the same plate. The electrodes in the first series were cadmium, iron, nickel, and copper, a self-induction coil being interposed to eliminate the air spectrum and the short metallic lines. Several plates taken from only the cadmium electrodes exhibited features of particular interest when minutely examined. Though the spectra are small, the instrument gives fine definition from the red potassium line aboutλ 7665.6 to that of cadmiumλ 2194.7.