Meteorological essays / by François Arago ... with an introduction, by Baron Alexander von Humboldt. Tr. under the superintendence of Colonel Sabine.

  • François Arago
Date:
1855
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Licence: Public Domain Mark

Credit: Meteorological essays / by François Arago ... with an introduction, by Baron Alexander von Humboldt. Tr. under the superintendence of Colonel Sabine. Source: Wellcome Collection.

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    netised Steel bars vibrating in close proximity to non-conducting substances, 302. Results not altogether explained by induced currents, 306. VoLTAlc PILE. Researches of MM. Gay-Lussac and Thénard, 278. M. Arago’s discovery in 1820, that the voltaic pile imparts magnetism to soft iron, 279. Experiments on -which it was established, 280. 3. ANIMAL ELECTRICITY. Electric girl. Report of the Commission of the French Academy on the ex- traordinary faculties said to be possessed by Mademoiselle Cottin, 309. Ellicot’s experiments on the reciprocal action of two pendulums attached to the same -wall, 312. Torpedo. Discussion regarding the priority of discovery, by M. Linari or M. Matteucci, of the identity between sparks drawn from the torpedo and those from electrical machines or voltaic piles, 307. 4. TERRESTRIAL MAGNETISM. Astatic needles employed by Barlow and Christie in observations of the diurnal variation of the déclination, 345 and 346. Baeloon. Biot and Gay-Lussac’s experiments on the magnetic force in a baUoon ascent, 371.; Beaufoy’s magnetic observations near London, 326. 335. 341. Bowditch’s magnetic observations in the United States, 335. Cassini’s magnetic observations on the déclination at Paris, 333. CoMPAss. Local déviation, 318. Means of improving ships’ compassés, 321. Déclination (magnetic) définition, 322. Secular change at Paris, 324. 354 ; at London, 325 ; at Copenhagen, 329. Lines of no deelination or isogonic lines, 329. Annual variation of the déclination, 332 ; at Paris, 353. Diurnal ditto, 337. 351. Eléments (magnetic). Their variations hâve no relation to the geogi-aphical or climatological characters of places on the globe, 317. Equator (magnetic), 317. 357. 367. Force (intensity of the magnetic), 368. Suggestion of a mode of determining its absolute value, 370, Variation at different heights above the surface of the earth, 371. Its diurnal variations, 373. .Supposed variation during solar éclipsés, 378. Gilpin’s magnetic observations on the déclination at London, 334. On the magnetic inclination at London, 364. Inclination (magnetic). Lines of equal inclination or isoclinal lines, 358. Ob- servations of the inclination at Paris from 1761 to 1851, 358—364 ; at London, 1786 to 1795, 364. Diurnal variation of, 381. Annual variation at Paris, 387. Secular change at Paris, 387. Observations (magnetic). M. Arago’s, 315. 324. 347. 375. 384. Colonel Beaufoy’s, 326. 335. 341. Cassini’s, 333. Gilpin’s, 334. 364. Bowditch’s, 335. 5. AURORA BOREALIS. Aurora Borealis mentioned by Roman writers, 390. By the Chinese 200 years before the Christian era, 390. Its general fcaturcs, as described by M. Lottin, from the observation of 143 auroras in Norway, 391. Descri])tions of auroras observed at varions places, 392. Heiglit of, 394. Sounds said to
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