. Carnegie Institution of Washington publication. 6 ABSORPTION SPECTRA OF SOLUTIONS speculum mirror M on the slit S. A similar arrangement was used for the fused silica cell. DTS is a double-throw switch, by means of which either the Nernst glower or the spark gap may be thrown in circuit. B is a bal- last. R is a variable resistance, by means of which the current in the Nernst glower, as shown by the ammeter A, may be kept constant. OC is an oil- condenser. IC isjm X-ray induction coil and R* is a resistance in the primary circuit of this Fig. A. In a recent paper Merton1 states that h
. Carnegie Institution of Washington publication. 6 ABSORPTION SPECTRA OF SOLUTIONS speculum mirror M on the slit S. A similar arrangement was used for the fused silica cell. DTS is a double-throw switch, by means of which either the Nernst glower or the spark gap may be thrown in circuit. B is a bal- last. R is a variable resistance, by means of which the current in the Nernst glower, as shown by the ammeter A, may be kept constant. OC is an oil- condenser. IC isjm X-ray induction coil and R* is a resistance in the primary circuit of this Fig. A. In a recent paper Merton1 states that he has studied the effect of pressure on the absorption spectra of solutions. This was studied here by Jones and Strong and the results published in the American Chemical The quotation of a paragraph from our earlier paper will show what was found: Some preliminary tests were made with the cells at high pressures. The Cailletet pump belonging to the Johns Hopkins University was used for this purpose, the cell being made so as to fit into this pump. It was not at all difficult to obtain pressures of 200 atmospheres with water and alcohol solutions. Spectrograms were made of the absorption spectra of neodymium solutions under pressures as high as 275 atmospheres. No effect of pressure was detected. The work at high pressures is easier than at high temperatures, on account of the fact that there is an expansion of the cell due to heating. It should be stated that in all of the work on absorption spectra which has been carried out in this laboratory for the past seven years, a grating spec- troscope has been used. The arrangement of the heated cell, the grating, photographic plate, etc., will now be discussed. 1 Proc. Roy. Soc, (A) 87, 146. 2 Amer. Chem. Journ., 47, 32, January Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly
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