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Charles Pritchard

1911 Encyclopedia Britannica

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The following year he was ordained, and became head master of a private school at Stockwell. From 1834 to 1862 he was headmaster of Clapham grammar school. He then retired to Freshwater, in the Isle of Wight, and took an active interest in the affairs of the Royal Astronomical Society, of which he became honorary secretary in 1862 and president in 1866. His career as a professional astronomer began in 1870, when he was elected Savilian professor of astronomy at Oxford. At his request the university determined to erect a fine equatorial telescope for the instruction of his class and for purposes of research, a scheme which, in consequence of Warren de la Rue's munificent gift of instruments from his private observatory at Cranford, expanded into the establishment of the new university observatory. By De la Rue's advice, Pritchard began his career there with a determination of the physical libration of the moon, or the nutation of its axis. In 1882 Pritchard commenced a systematic study of stellar photometry. For this purpose he employed an instrument known as the "wedge photometer" (see Photometry, Celestial, and Mem. R.A.S. xlvii. 353), with which he measured the relative brightness of 2784 stars between the North Pole and about - so declination. The results were published in 1885 in his Uranometria Nova Oxoniensis, and their importance was recognized by the bestowal in 1886 upon him, conjointly with Professor Pickering, of the Royal Astronomical Society's gold medal. He now resolved to try the experiment of applying photography to the determination of stellar parallax. With the object of testing the capabilities of the method, he took for his first essay the well-known star 61 Cygni, and his results agreed so well with those previously attained that he undertook the systematic measurement of the parallaxes of second-magnitude stars, and published the outcome in the third and fourth volumes of the Publications of the Oxford University Observatory. Although some lurking errors impaired the authority of the concluded parallaxes this work ranks as a valuable contribution to astronomy, since it showed the possibility of employing photography in such delicate investigations. When the great scheme of an international survey of the heavens was projected, the zone between 25° and 31° north declination was allotted to him, and at the time of his death some progress had been made in recording its included stars. Pritchard became a fellow of New College, Oxford, in 1883, and an honorary fellow of St John's College, Cambridge, in 1886. He was elected a fellow of the Royal Society in 1840, and in 1892 was awarded one of the royal medals for his work on photometry and stellar parallax. He died on the 28th of May 1893.

See Proc. Roy. Soc. liv. 3; Month. Notices, Roy. Astr. Soc. liv. 198; W. E. Plummer, Observatory, xvi. 256 (portrait); A str. and Astrophysics, xii. 592; J. Foster, Oxford Men and their Colleges, p. ,u6; Hist. Register of the Univ. of Oxford, p. 95; The Times (May 30, 1893); C. J. Robinson's Register of Merchant Taylors' School, ii. 210; Charles Pritchard, D.D., Memoirs of his Life, by Ada Pritchard (London, 1897).