[14] Legat. Brix. Z. S. ix. p. 125.
[15] Reis. “Téléphonie.” Polytechnic Journ. clxviii. p. 185; Böttger’s Notizbl. 1863, No. 6.
[16] J. C. Poggendorff. Pogg. Ann. xcviii. p. 192; Berliner Monatsber. 1856, p. 133; Cosmos, ix. p. 49; Berl. Ber. xii. p. 241; Pogg. Ann. lxxxvii. p. 139.
[17] Du Moncel. Exposé, ii. p. 125; also, iii. p. 83.
[18] Delezenne. “Sound produced by Magnetization,” Bibl. Univ. (new series), 1841, xvi. p. 406.
[19] See London Journ. xxxii. p. 402; Polytechnic Journ. ex. p. 16; Cosmos, iv. p. 43; Glösener—Traité général, &c. p. 350; Dove.-Repert. vi. p. 58; Pogg. Ann. xliii. p. 411; Berl. Ber. i. p. 144; Arch. d. Sc. Phys. et Nat. xvi. p. 406; Kuhn’s Encyclopædia der Physik, pp. 1014-1021.
[20] Gore. Proceedings of Royal Society, xii. p. 217.
[21] C. G. Page. “Vibration of Trevelyan’s bars by the galvanic current.” Silliman’s Journal, 1850, ix. pp. 105-108.
[22] Sullivan. “Currents of Electricity produced by the vibration of Metals,” Phil. Mag. 1845, p. 261; Arch. de l’Électr. x. p. 480.
[23] The full description of this figure will be found in Mr. Alexander J. Ellis’s translation of Helmholtz’s work, “Theory of Tone.”