[1] “Il y a des grands seigneurs dont il ne faut approcher qu’avec d’extrêmes précautions. Le tonnerre est de ce nombre.”—Dict. Philos. art. Foudre.
[2] Electricité Statique, ii., 561.
[3] Deschanel’s Natural Philosophy, Sixth Edition, p. 641.
[4] Fragments of Science, Fifth Edition, p. 311.
[5] Lecture on Thunderstorms, Nature, vol. xxii., p. 341.
[6] Third Series, vol. v., p. 161.
[7] Phil. Trans. Royal Society, 1834, vol. cxxv., pp. 583-591.
[8] In experiments with a Leyden jar, Feddersen has shown that the duration of the discharge is increased, not only by increasing the striking distance, but also by increasing the size of the jar. Now, a flash of lightning may be regarded as the discharge of a Leyden jar of immense size, with an enormous striking distance; and therefore we should expect that the duration of the discharge should be greatly prolonged. See American Journal of Science and Arts, Third Series, vol. i., p. 15.
[9] See original paper by Swan, Trans. Royal Society, Edinburgh, 1849, vol. xvi., pp. 581-603; also, a second paper, ib. 1861, vol. xxii., pp. 33-39.
[10] Nature, vol. xxviii., p. 54.