Abstract
THE change is studied by observing the shift in the interference fringes obtained by Jamin's plates. The change is purely local in the region of the luminous discharge. By varying the pressure inside the air-tube, it is found that the shift is a maximum at a pressure of the order of 2.5 cm. of mercury. Ionisation of the air by X-rays or by Tesla discharge does not cause any appreciable shift.
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SETH, J. A Change in the Refractive Index of Air when an Electric Glow Discharge is passing through it. Nature 120, 880 (1927). https://doi.org/10.1038/120880d0
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DOI: https://doi.org/10.1038/120880d0
