ON MAGNETISM. 543 



Compensation for Local Attraction. Sabine, Ph. Tr. 1819, p. 112. Barlow, 

 ibid. 1831, p. 215. Airy, ibid. 1839, p. 167. 



Instruments. Mariner's Compass. Lous, Tentamen Exp. ad Compassum per- 

 ficiendum, 4to, Hafnise, 1734. Knight, Ph. Tr. 1750, pp. 505, 513. Duhamel, 

 Hist, et Mem. 1750, p. 154. Bain on the Compass, 1817. Gilbert, M'Culloch, 

 and Alexander's Compass, in Barlow's art. Magnetism in Encyc. Metr. Kater, Ph. 

 Tr. 1821, p. 104. 



Declination. Lahire, Hist, et Mem. 1716, p. 7. Lemonnier, ibid. 1778, p. 68. 

 Coulomb, ibid. 1785, p. 560. Wilcke, Schwed. Abhand. 1763, p. 154. Brander, 

 Beschreibung eines Mag. Dec. und Incl. Augsb. 1779. Cassini, Mem. de 1'Inst. v. 

 145. Prony, Jour, de Phy. xliv. 474. Troughton, Nich. Jour. 1806, p. 179. 

 Bidone, Mem. de TurinJSll, p. 141. Bessel, Schumacher's Ast. Nachr. vi. 221. 

 Weber, Res. des Mag. Ver. 1837, p. 104. Gauss, ibid. 1841, p. 1. Simonoff, 

 ibid. 62. Report of the Committee of Physics of the Royal Soc. 1840, p. 30. 

 Lamont, Ann. fur Meteorolog. und Erdmagnet. 1842, ii. 179. Gambey in Pouillet's 

 Physique, pi. xi. fig. 266. The practical processes of finding the variation at sea will 

 be found in Raper's Navigation and Nautical Ast. 1840. 



Inclination. Buache, Hist, et Mem. 1732, p. 377. Nairne, Ph. Tr. 1772, 

 p. 476. Borda, Gilb. Ann. iv. 449. Robinson, in Sabine Ph. Tr. 1822, p. 1. 

 Weber, Res. der Gott. Ver. 1837, p. 81. Kreil, Die Mag. Apparat. zu Prag. ibid. 

 1839, p. 91. Lloyd on the Mag. Obs. at Dublin, 4to, 1842. 



Intensity. Coulomb, Mem.de 1'Instit. iii. 176. Hansteen, Beobachtungen iiber 

 die Intensitat des Mag. in Nord Europa, Pogg. Ann. iii. 225. Christie, Ph. Tr. 

 1833, p. 343. Gauss, Magnetometer, 4to, Gott. 1833 ; Res. des Mag. Ver. 1837, 

 p. 1, 20, 58 ; 1840, p. 1. Weber, ibid. 1836, p. 63 ; 1838, p. 68 ; 1841, p. 79; 

 translated in Sci. Mem. vol. ii. Lamont, Ueber Bestimmung der Horizontal-Inten- 

 sitat, 4to, Munch. Ueber das Mag. Observatorium bei Miinchen, 4to, 1842. 



Theory of Terrestrial Mag. Whiston, The Latitude and Longitude found by the 

 Dipping Needle, 1721. Zegollstrom, Theoria Decl. Mag. Upsal, 1755. Dunn's 

 Mag. Atlas, 1776. Steinhauser, De Mag. Telluris, Wittenb. 1806. Mollweide, 

 Gilb. Ann. xxix. 1, 251, Ixx. 26. Humboldt and Biot, Jour, de Phy. xlix. 429. 

 Quinet, Theorie de 1' Aimant, 4to, Paris, 1809 ; Expos des Variations, Mag. 1826. 

 Hansteen, Untersuchungen iiber den Mag. der Erde, 4to, Christiana, 1819 ; Gilb. 

 Ann. Ixv. 313, Ixx. 36, 110, Ixxi. 273, Ixxv. 145 ; Pogg. Ann. iv. 277, ix. 49, 229, 

 xxviii. 473, 578. Schumacher's Ast. Nach. vii. 17. Duperrey's Chart, Pogg. Ann. 

 xxi. 151. Barlow, Ph. Tr. 1831, p. 99. Gauss, Intensitas Vis Mag. Terrest. ad 

 Mensuram revocata, Gott. 1833 ; Sci. Mem. ii. 184, 313. Res. des Magn. Vereins, 

 1838, p. 1, 146; 1839, p. 50. Gauss and Weber's Atlas, 4to, Leipz. 1840. 

 Sabine, Ph. Tr. 1840, p. 129; 1841, p. 11 ; 1842, p. 9. Bessel, Schum. Ast. 

 Jahrb. 1843, p. 117. 



Observations. See Christie's Report Br. Ass. 1833 ; Sabine's Report, vol. vi. ; 

 or Dove's Repertor. Band v. ; from which the preceding list is for the most part 

 extracted : also Kupfer Recueil d'Obs. faites a St. Petersb. 4to, 1837. . . Annu- 

 aire Magnetique, 5 vols. 4to, St. Petersb. 1836. . . Gauss and Weber, Resultate, 

 Leipz. 1836.... and Scientific Mem. ii. 20. Kreil, Mag. und Meteor. Obs. zu 

 Prag. 4to, 1839. Lamont, Ann. der Meteor, und des Erdmagnetismus, Munch. 

 1842. Quetelet, Mem. de Brux. xvi 



Electro-magnetism. Kastner, Obs. de Electro-mag. Erlang. 1821. Schrader, 

 Dissertatio de Electro-mag. Halse, 1821. Erman , Umrisse zu Elektr. Magn. Berl. 

 1821. Seebeck, Ueber den Magn. des Galvan. Kette, 4to, Berl. 1822. Am- 

 pere, Recueil d'Obs. Electro-magn. 1822 ; Mem. sur la Theorie Math, des Phen. 

 Electro-dyn. Mem. de 1'Instit. 1823, vi. 175 ; Ann. de Ch. xv. 57. Precis 

 de la Theorie des Phsen. Electro-dyn. 1824 ; ExposS Methodique des Phaen. 1824 ; 

 Theorie des do. 4to, 1826. Demonfernand's Manuel, 1823 ; translated by Gumming, 

 with additions, Camb. 1827. De la Rive, Recherches sur la Distribution de 1'Electr. 

 Dyn. dans les Corps, Geneve, 1825. Pfaff, Der Electro-mag. Hamburg, 1824 ; 

 Gilb. Ann. Ixxiv. 249. Guerin, Action Mutuelle des Fils Conducteurs, &c. 1828. 

 Pohl, Der Electro-mag. Theor. Practisch Dargestellt, Berlin, 1830. Fechner, 

 Elementarlehrbuch des Elektr. Leipz. 1830. Watkins's Electro-mag. 1832. 

 Poisson, Theorie du Mag. en Mouvement, Mem. de 1'Inst. vi. 439. Nobili, 

 Question^ sul Magnetismo, Modena, 1838. Antologia di Firenze, Nos. cxxxi. &c. 

 Marias4ni, Mem. di Fisica Sperimentale, Modena, 1838. Zantedeschi, Relazione 

 Storico-critica Sperimentale nell' Elettro-mag. Venice, 1840. Matteuci, Bibliot. 

 Univ. 1840. 



