Abstract

Temperature and pressure changes during observation by means of a Fabry-Perot interferometer are discussed. A temperature regulated vacuum chamber has been designed to minimize the effects of these changes. Details of a simple and efficient interferometer and housing are given. A convenient and satisfactory oven for holding a Michelson lamp at any desired temperature between that of the room to the standard 315°C is described in detail. The vacuum interferometer, the lamp house, and the assembly used to compare the spectra of Hg-198 and Cd-114 are shown by diagram and drawing.

© 1956 Optical Society of America

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