Application of the Baker interference microscope in fiber research is described. It was found possible to reveal and distinguish fine details of the fiber structure and to recognize even minute differences in refractive index by color contrast. It is furthermore possible to determine quantitatively the refractive index of these details. The theoretical back ground is considered and the technique employed described. Typical examples with different fibers are shown.
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A. N. J. Heyn (1957) studied this question.