References.—Poggendorff, Vol. I. pp. 53, 54, and the several biographies named at p. 202, Vol. I of “Johnson’s New Univ. Cycl.,” 1877; J. A. Barral, “Œuvres de F. Arago,” 1854–1855; Faria E. De e Arago, “Breve compendio ...” Lisbon, 1800; Arago’s “Notices Scientifiques,” “Cat. Sc. Papers Roy. Soc.,” Vol. I. pp. 80–84; Vol. IV. pp. 697–701; Vol. VI. pp. 567, 736–737; Vol. VIII. p. 537; “Encycl. Metropol.,” Vol IV (Magnetism), pp. 6, 7; J. F. W. Herschel, “Nat. Phil.,” 1855, pp. 117, 244, and his account of the repetition of M. Arago’s experiments on rotatory magnetism in Phil. Trans. for 1825; Whewell, “Hist. Induc. Sci.,” 1859, Vol. II. p. 226; Phil. Mag., Vols. LIX. p. 233; LVII. pp. 40–49; LVIII. p. 50; LXI, p. 134; “Lib. Useful Knowledge’” (Magnetism), p. 91; Noad, “Manual,” pp. 204, 534; “Ann. of Sci. Disc.” for 1850, p. 124; Harris, “Rud. Magn.,” Parts I, II. pp. 58–61 and Phil. Trans. for 1831, Part I; Prime’s “Life of Morse,” pp. 168, 265, 266; Gmelin’s “Chemistry,” Vol. I. p. 317; Comptes Rendus for 1836, Vol. II. p. 212; Dredge, “Electr. Illum.,” Vol. II. p. 122; Sturgeon, “Scient. Res.,” Bury, 1850, pp. 13, 37, 216, etc.; Appleton, “New Am. Cycl.,” Vol. XI. p. 71; Sci. Am. Suppl., No. 204, p. 3254; La Lumière Electrique for Oct. 31, p. 202; “Reports of the Smithsonian Institution” for 1857, pp. 102, 107; for 1862, pp. 132–143, and p. 127 of last named for Malus’ discovery. Houzeau et Lancaster, “Bibl. Générale,” Vol. I. part. i. pp. 676–677 detailing the contents of Arago’s “Œuvres Complètes,” published in thirteen volumes under the direction of J. A. Barral, also Vol. II. p. 76; Cornhill Magazine, Vol. XVII. p. 727; Pierre Prévost, “Tentative,” Genève, 1822 (Poggendorff, Vol. II. p. 525); Phil. Mag., Vol. LVIII. p. 50; Vol. LXI. p. 134; “Abstracts of Papers ... Roy. Soc.,” Vol. II. p. 249.
A.D. 1821.—Ridolfi (Marquis Cosimo di), an Italian agriculturist, is the author of several treatises on fenomeni elettro-magnetici, published in Florence, wherein he expresses the belief that “because electricity produces both magnetic and calorific phenomena, the elements giving these separately may possibly be so compounded together as to produce electricity; which infers that electricity is a compound of magnetism and caloric.”
References.—“Antologia di Firenze,” 1824, p. 159, and “Biblio. Ital.,” Vol. LXIII. p. 268 for Ridolfi’s description of the electric plate machine of Novellucci; also “Annales de Chimie et de Physique,” Vol. X. p. 287; Sturgeon, “Scientific Researches,” 1850, Sec. I. p. 29; “Bibliothèque Universelle” for Feb. 1821.
A.D. 1821.—Scoresby (Dr. William) (1789–1857), English master-mariner, and author of numerous scientific and other treatises, first publishes, in the “Trans. of the Edinburgh Society,” accounts of his magnetometer—magnetimeter—and of his electro-magnetic experiments. These were duly followed up by full reports of his many interesting investigations relative, more particularly, to the development of magnetic properties of metals by percussion, as well as to magnetic induction, and regarding the uniform permeability of all known substances to the magnet’s influence.
References.—“Abstracts of Papers ... Roy. Soc.,” London 1832–1833, Vol. II. pp. 108, 168, 210; “Dict. of Nat. Biog.,” London, 1897, Vol. LI. p. 6; Phil. Trans. for 1822–1824; “Trans. Edin. Soc.,” Vol. IX. pp. 243–258, 353, 465; Vol. XI for 1824; Vol. XII for 1831; Vol. XIII for 1832, and Vol. XIV for 1833; “Brewster’s Jour. of Sc.,” Vol. VIII for 1828; “Bibliothèque Britannique,” Genève, 1796, N.S., Vol. XXIX for 1825, p. 185; “Edin. Phil. Jour.” for 1823, Vol. IX. p. 45.
A.D. 1821.—Babinet (Jacques) (1794–1872), French scientist, is the author of a very valuable treatise, published in Paris, upon the magnetical discoveries of Oersted, Ampère, Arago, Davy and others. This was followed by his “Résumé complet de la physique,” etc., and by a companion work treating of the relations of ponderable and imponderable bodies to the phenomena of magnetism and electricity, also, during the year 1829, by his Memoir upon the determination of terrestrial magnetism.
He succeeded Savary as Professor at the Collège de France in 1838, and, two years later, took the place of Dulong in the section of General Physics at the Académie des Sciences, becoming not long after the Assistant Astronomer at the Paris Observatory for Meteorology.
His numerous scientific treatises are to be found throughout the “Mémoires de la Société Philomathique,” the “Annales de Physique,” the “Comptes Rendus,” the “Revue des Deux-Mondes” and other prominent publications of the day.
References.—Larousse, “Dict. Univ.,” Vol. II. p. 10; “Eng. Cycl.,” London, 1872, Supplement, p. 143; “Biog. Gén.,” Vol. IV. p. 21; Mme. Blavatsky, “Isis Unveiled,” Vol. I. p. 202; and Ronalds’ “Catalogue,” pp. 10–11, for the joint works of Ampère and Babinet.
A.D. 1821.—Pfaff (Christian Heinrich) (1773–1852), who became Professor of Medicine, Physics, etc., at the Kiel University, and was one of the most energetic followers of Volta, sends an unusually interesting communication to Gilbert’s “Annalen der Physik” and to Schweigger’s “Journal für Chemie und Physik,” wherein he very ably supports the views of the Pavia physicist.