[38] _Journal_ of the Russian Physical and Chemical Society, Vol. XXVIII., Division of Physics, Part I., January, 1896. [39] See British Patent Specification No. 12,039, June 2, 1896. [40] British Patent Specification No. 19,710 of 1899. [41] _Comptes Rendus._, Vol. CXXVIII., p. 1,225, 1889; _Science Abstracts_, Vol. II., p. 521. [42] _Il Nuovo Cimento_, Vol. X., p. 279, 1899. [43] _Wied Ann._, Vol. LXVIII., p. 594, 1899; _Science Abstracts_, Vol. II., p. 757. [44] _Comptes Rendus_, Vol. CXXX., p. 902, 1900; _Science Abstracts_, Vol. III., p. 615. [45] See _Proc._ Roy. Soc., London, Vol. LXXI., p. 402. [46] See Report by Capt. Quintino Bonomo, "Telegrafia Senza Fili," Rome, 1902; _L'Elettricista_, Ser. II., Vol. I., pp. 118, 173. [47] See Royal Institution, Friday evening discourse, by Mr. Marconi, June 13, 1902; also _The Electrician_, Vol. XLIX., p. 490; also a letter to _The Times_ of July 3, 1902, by the Marchese Luigi Solari. [48] See U.S.A. Patent Specification No. 700,161, May 24, 1900. [49] See E. Marx, _Phys. Zeitschrift_, Vol. II., p. 249; _Science Abstracts_, Vol. IV., p. 471. See also German Patent Specification No. 121,663, Class 21a. [50] See "The Scientific Writings of Professor Joseph Henry." [51] _Phil. Trans._ Roy. Soc., London, 1897, Vol. CLXXXIX.A, p. 1. [52] See _Proc._ Roy. Soc., London, June 12, 1902. "Note on a Magnetic Detector for Electric Waves which can be employed as a Receiver for Space Telegraphy," by G. Marconi. [53] See U.S.A. Patent Specification No. 716,000, Application of July 5, 1901. [54] See the _Electrical Review_, Vol. XLIV., 1899, May 26; _Wied Ann._, Vol. LXVIII., p. 92; or German Patent Specification No. 107,843. [55] U.S.A. Patent Specification No. 706,742, 1902. [56] See British Patent Specification, G. Marconi, No. 12,039, June 2, 1896. [57] See G. Marconi, British Patent Specification No. 12,326, of June 1, 1898. [58] See the _Electrical Review_, September 26, 1902, Vol. LI., p. 543. [59] There is a good deal of contradiction between various inventors on this point, some saying that "earthed" aerials obviate atmospheric electrical disturbances, and others that insulated aerials are in this respect superior. The truth appears to be that, neither form is absolutely free from risk of disturbance by this cause. [60] The capacity of an electrical circuit corresponds to the elastic pliability, or what is commonly called the elasticity, of a material substance, and the inductance to mass or inertia. Hence capacity and inductance are qualities of an electric circuit which are analogous to the elasticity and inertia of such a body as a heavy spring. [61] See Cantor Lectures, on "Electrical Oscillations and Electric Waves," delivered before the Society of Arts, London, November 26, December 4, 10, 17, 1900. Lecture I., p. 12, of reprint. [62] A fuller account of these experiments was given by the author in a letter to the London _Times_ published on April 14, 1903.