438 



CATALOGUE. — MAGNETIC SUBSTAKCES.. 



Abridgment of Coulomb's theory. Journ. 



Phys. XLV. (II.)448. 

 Silberschlag. A. Berl. 1786. 



Deduces magnetic attraction from currents. 



Rittenhouse, Am. tr. II. 178. 

 HauyTheoriede I'etectricite at du magnet- 



isme. 

 Prevost de I'origine des forces magnetiques. 



8. Genev. 1788. 

 Viallon's theory of magnetism. Roz. XLIII. 



208. 

 On supposed magnetic currents. Nich. 8. 1. 



234. 

 Arnim on the theory of magnetism. Gilb. 

 III. 48. VIII. 84. 



The magnetic arrangement of filings may be imitated by 

 strewing powder on a coated plate of glass placed on two 

 electric balls. Robison. 



Magnetic Substances. 



Pa"-et and Hooke on the effect of heat on the 



magnet. Birch. IV. 256, 264. 

 Musschenbroekonthe Indian magnetic sand. 



Ph.tr. 1734. XXXVllI. 297. 

 Galeationthe iron found in different bodies. 



C. Bon. II. ii. 

 Arderon on giving pohirity to brass. Ph. tr. 



1758. 774. 

 Lehmann on the magnetism of copper and 



brass. N. C. Petr. XII. 368. 

 On the universality of magnetism. TBrug- 



mann by Eschenbach. Leipz. 1781. 

 Coulomb. A. P. 1784.266. 



Found that wire, when twisted, received 9 tijnes as much 

 ■magnetic force. 



Coulomb on universal magnetism. B. Soc. 

 Phil. n. 61, 63. Journ. Phys. LIV. 240, 

 267, 454. Journ.R. I., I. Ph. M.XII. 278. 

 XIII. 401. Gilb. XI. 254, 367. XII. 194, 

 A metal is affected if it conuins only y^^ part of iron. 



Kohl on pure cobalt. Crell. N. E. VII. sg. 

 Cavallo on the magnetism of various sub- 

 stances. Ph. tr. 1786. 62. 

 Finds, that a smaller quantity of iron will affect the needle 

 than can be detected by any chemical test. Some pieces of 

 nickel were not magnetic, but they were found to contain 

 cobalt. Some brass, but not all, becomes magnetic by ham- 

 mering, and loses its power by heat ; and this effect could 

 not be produced by an artificial mixture of iron with brass. 



Cavallo's experiments. Ph.tr. 1787.6. 



Almost all substances attracted needles floating on a very 

 clean surface of quicksilver. The brass which was least mag- 

 netic was not rendered magnetic by hammering. Iron 

 while dissolving in an acid, disturbed the needle 1°. Red 

 hot iron is not attracted. This Gilbert had before observed. 



Brisson. A. P. 1788. l6l. 



Cast steel is unfit for magnetic use ; English and German 

 steel best. 



Bennet. Ph.tr. 1792-81. 



Thinks that Cavallo's experiments on solution and on 

 hammering may be explained from the production of pola- 

 rity in the substances. But is difficult to conceive, that po- 

 larity in this sense can increase the attraction. 



Landriani in Mayers sammlung. 8. Dresd. 



1793. III. 388. 

 Humboldt on a magnetic serpentine. Ann. 



Ch. XXII. 51. Journ. Phys. XLV. (II.) 



314. 

 Von Arnim on magnetic substances, Gilb. V, 



384, 



With a catalogue, 

 Yourtg on Coulomb's experiments. Journ. 



R. I., I. 

 Carradori on Coulomb's universal magnel- 



isni. Journ. Phys. LV. 450. 

 Sage on the magnetism of nickel. Ph. M. 



XIII. 58. 

 Thenard on nickel. B. Soc. Phil. n. 68. 

 Chenevix on the magnetism of nickel. Nich. 



8. III. 286. Gilb. XI. 370. 



Hatcheit on magnetical pyrites. Ph.tr. 1804. 

 315. 



The smallest mixture of antimony destroys the polarity 

 of iron. M. Young. 



