Old and New Astronomy

Details Old and New Astronomy Old and New Astronomy

Sep 1893

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1893natur..48..438.&link_type=abstract

Nature, Volume 48, Issue 1245, pp. 438 (1893).

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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