Abstract
MRS. PROCTOR-SMYTH is in error in supposing that my note referred to Section 97 of “Old and New Astronomy.” I referred to Section 100, in which the author says “the pencil of light proceeding from a point such as P, Figs. 14, 16, and 18, consists of rays of different refrangibility, and therefore not converging to a focal point such as p but to a focal line in the axis of the pencil.” (The italics are mine.) Fig. 18 is a diagram of the formation of a real image by a reflector. The reference to Fig. 18 may have been a slip; if so, it should have been corrected in the completed volume, as otherwise the student, reading the subsequent paragraphs, to which Mrs. Proctor-Smyth refers, is confused as to what the author really means, and is doubtful whether the reflector does or does not suffer from chromatic aberration. THE REVIEWER
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Old and New Astronomy. Nature 48, 438 (1893). https://doi.org/10.1038/048438c0
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DOI: https://doi.org/10.1038/048438c0
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