[10] The giant mirrors of Herschel (1789) and Rosse (1842) were made of an alloy of 71% copper and 29% tin, and 68½% copper and 31½% tin, respectively. This alloy was known as “speculum metal.” The silvered glass mirror was pioneered by Steinhill and Foucault in 1856. In England Dr. A. A. Common made considerable use in the 1870’s of silvered glass mirrors made by George Calver. About 1892-97 Common himself made, but never finished, a 60-inch mirror. It was later refigured and is still in use. On these matters see King, _op. cit._ (footnote 6). [11] For a list of these, see appendix, p. 184. [12] Words crossed out in manuscript. See figure 1. [13] For a list of Fitz material in the U.S. National Museum, see appendix, p. 184. [14] F. W. Preston, “The first big American telescope mirror, John Peate, his lens,” _Bulletin of the American Ceramic Society_, 1936, vol. 15, pp. 129-152. Hereafter cited as Preston. [15] The circumstances of Peate’s life and ministerial career are from Preston, supplemented by Dr. Peate’s service record, provided by the Erie Conference of the Methodist Church. Dr. Preston’s prime sources are: J. N. Fradenburgh, _History of the Erie Conference_, Oil City, Pa., 1907, vol. 2, pp. 204-211; obituary notice by R. N. Stubbs in _Minutes of the Erie Conference_, pl. publ. 1903, p. 90. Other data were obtained by Preston through interviews and letters, all cited in detail in the article. [16] From information provided by Robert Barr, acting secretary of Oberlin College, February 15, 1960. The college records show a John Peate from Buffalo enrolled in the preparatory department in 1842-43 and 1844-45. The _Encyclopedia Americana_ (1924 ed., vol. 21, p. 460) states that Peate attended Oberlin about this time. The Doctorate was an honorary one conferred by Allegheny College. [17] Fradenburgh, _op. cit._ (footnote 2), p. 204. [18] Preston, p. 130, n. 10; p. 131, n. 19; p. 148. [19] “On the Construction of a Silvered Glass Telescope, Fifteen and a Half Inches in Aperture, and its Use in Celestial Photography,” _Smithsonian Contributions to Knowledge_, vol. 14, art. 3, iv+55 pp., 1865 (reprinted in vol. 34 as art. 2, 1904). [20] Preston, p. 148. From an article in the Greenville, Pa., _Record Argus_, December 17, 1903. [21] Preston, p. 148. In 1960 it was further learned that an “American Temperance” college or university once existed at Harriman. [22] _Scientific American_, October 24, 1891, vol. 65, p. 260. [23] Communication from Thiel College, Preston, p. 131, n. 17. [24] _Popular Astronomy_, July 1898, vol. 6, p. 310. [25] Preston, p. 129, notes 2 & 3. Based on recollections of George Lambert (1895) and John Morrison (1903). That the decision to make the mirror 62 inches in diameter may have had another origin is suggested by the fact that Common, in England, had made two mirrors of 60 and 61 inches in 1886-91. [26] Minutes of the Erie Conference, 1893, p. 29. Preston, p. 130, n. 4.