Precise Measurements of Dispersion in Nitrogen

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Abstract
A new and much improved displacement interferometer has been built after the general plan of the one previously described to measure simultaneously refractive index and dispersion constants for a gas over a range of pressures above atmospheric. It is constructed as a single unit on a steel I-beam framework 10 feet long and 2 feet wide. The whole apparatus is supported on automobile inner tubes which very effectively eliminate vibration. The features also include a G.E. S-1 sunlamp light source, aluminum mirrors, a carefully calibrated micrometer screw of high quality and an improved temperature control.