Abstract
LONDON. Royal Society, February 13.—Sir Archibald Geikie, K.C.B., president in the chair.—Prof. R. A. Sampson: A Cassegrain reflector with corrected field. The purpose of this memoir is to discover an appliance which shall correct in a practical manner the faults of the field of a Cassegrain telescope white leaving unimpaired its characteristic features of great focal length, convenient position of the observer and achromatism. It is shown in agreement with the investigation of Schwarzschild that two mirrors alone cannot correct the field without introducing impracticable Curves or sacrificing the general design. A system of leflses is investigated which shall effect the purpose. Three tenses is the least number which can satisfy the two conditions of achromatism.
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Societies and Academies . Nature 90, 689–691 (1913). https://doi.org/10.1038/090689a0
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DOI: https://doi.org/10.1038/090689a0