Abstract
MR. C. E. STROMEYER greatly exaggerates the possible effects of astigmatism of the cœlostat mirrors on the positions of the star images. He appears to consider that the pencils forming the different images are reflected from entirely different portions of the cœlostat surface. As a matter of fact, with the 4-in. lens the pencil producing the extreme star image was reflected from a portion of the mirror which had 85 per cent, of its area common to that producing the central pencil, and with the 13 in. lens (stopped down to 8 in.) the common portion was even greater.
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DYSON, F. [Letters to Editor]. Nature 107, 682 (1921). https://doi.org/10.1038/107682b0
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DOI: https://doi.org/10.1038/107682b0
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