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A combination of Michelson interferometer and spectroscope is described which has proved useful in giving accurate values of the refractive indices of vapors, especially near absorption lines. The method involves measurements, easily made, of wave lengths of fringes seen in the spectroscope....
A form of ripple tank is described in which the point source of waves is simply a succession of periodic air blasts directed downward onto the surface of the water. Two or more such sources can be used simultaneously and their positions are readily changed from place to place. For the production...
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