A specially designed microscope objective and mounting, calculated to exhibit coma in the absence of spherical aberration and astigmatism, are described. Photographs of a "star" image, taken when the amount of coma is equivalent to that for which the light distribution has been calculated by the author, are found to verify the numerical work. The photometric examination of the photographic image is carried out by a special method.
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L. C. Martin (1922) studied this question.