Abstract

Fringes of equal chromatic order were formed by the film between a silvered cleavage face and a partially silvered optical flat. Crystal cleavage steps were determined from measurements of fringe steps. The b dimension of the unit cell was determined by a method of successive approximations to be 8.81±0.07A which agrees with the x-ray value within the experimental error.

© 1953 Optical Society of America

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