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Published online by Cambridge University Press: 20 January 2009
§ 1. This paper deals with certain formulae which, though probably not all new, have not appeared in the text-books. They were suggested to the writer while engaged in discussing the expression for the intensity of the transmitted beam in the Lummer Gehrcke Interference Spectroscope, viz.
* See DrGehrcke, E., Die Anwendung der Interferenzen in der Spectroslcopie und Metrologie, (Braunschweig, 1906), p. 69.Google Scholar I have modified the notation. The subject wag brought to my notice by Prof. A. L. Selby.
† n=15, p=883 are the actual values in a typical ease.