. The London, Edinburgh and Dublin philosophical magazine and journal of science. he electrons.) (4) The measured effect is not influenced by changes in thepressure of the residual gas in the apparatus, provided this bereasonably low. (5) Under certain conditions, not yet completely deter-mined, the thermionic emission from osmium becomes un-stable ; and there are two ranges of stability, one at low andthe other at high temperatures. We are glad to take this opportunity of thanking , Carter, Critchlow, Ferger, Frederick, and Gibbsfor again assisting in taking the very numerous ob
. The London, Edinburgh and Dublin philosophical magazine and journal of science. he electrons.) (4) The measured effect is not influenced by changes in thepressure of the residual gas in the apparatus, provided this bereasonably low. (5) Under certain conditions, not yet completely deter-mined, the thermionic emission from osmium becomes un-stable ; and there are two ranges of stability, one at low andthe other at high temperatures. We are glad to take this opportunity of thanking , Carter, Critchlow, Ferger, Frederick, and Gibbsfor again assisting in taking the very numerous observations. Palmer Physical Laboratory,Princeton, * 0. W. Richards jn, Rapports du Congres Int. de Radioloqie, Bruxelles,1910. [ 411 ] XLTX. Interferometry with the Aid of a Grating. By CarlBar us, , , Professor of Physics at Brown University, Providence, * Part I.—Introduction. 1. R<mi%rks on the Phenomena.—In the earlier papers f Idescribed certain of the interferences obtained when theoblique plategg, fig. 1, of Michelsons adjustment, is replaced. by a plane diffraction-grating on ordinary plate glass. Someexplanation of these is necessary here. In the figure, L isthe source of white light from a collimator. Such light istherefore parallel relative to a horizontal plane, bnt con-vergent relatively to a vertical plane; M and N are the usualsilver mirrors. A telescope adjusted for parallel rajs in theline GrE must, therefore, show sharp white images of the the grating is usually slightly wedge-shaped, there will be(normally) four such images, two returned by M after re-flexion from the front (white) and rear face (yellowish) ofthe plate gg, and two due to N. There will also be twoother, not quite achromatic slit images from N or M, re-spectively, due to double diffraction before and after will be treated below. In the direction GD therewill thus be a corresponding number of diffraction spectra,more or less coincident in all t
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