Application of Phase Microscopy to Textile Fiber Research

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Abstract
Considerable attention is being given to applications of a comparatively recent develop ment in the field of microscopy known as "phase microscopy" (also called "phase difference" and "phase contrast microscopy"). An ordinary light microscope is transformed into a phase microscope by placing light-controlling diffraction plates in the objective lens system. By the use of this device the full aperture of the objective lens may be used, thus eliminating the dis tortion which frequently occurs when the condenser is stopped down and revealing details which are not observable with the ordinary light microscope. In the United States the Research Department of the Scientific Instrument Division, Ameri can Optical Company, has independently developed a phase microscope which is being used by a number of organizations in a variety of fields including biology, medicine, mineralogy, and textiles. Bennett et al. [1] have described the phase microscope and have discussed the theoretical principles upon which it is based. These theoretical principles are also set forth in an excellent paper by Köhler and Loos, a translation of which appears on page 82 of this issue. This article, which illustrates typical applications of the phase microscope in the textile field, . is a translation of a manuscript obtained by Mr. Werner von Bergen, Technical Intelligence In vestigator in Germany, for the Office of The Quartermaster General, from Dr. H. Reumuth, formerly of the Microscopic Laboratory of I. G. Farbenindustrie at Höchst. The transla tion is by members of the staff of that laboratory.—Editor

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