[63] See _Journal_ of the Society of Arts, Vol. XLIX., p. 505. "Syntonic Wireless Telegraphy," by G. Marconi. [64] See German Patent Specifications, Class 21a, No. 7,452 of 1900, and also No. 8,087 of 1901. [65] See German Patent Specification, Class 21a, No. 7,498 of 1900, applied for November 9, 1900. The above-mentioned patent is subsequent in date to Mr. Marconi's experiments on the same subject. [66] See _The Electrician_, January 18, 1900, Vol. XLVI., p. 475. Also reprint of a Paper of Professor A. Slaby, "Abgestimmte und mehrfache Funkentelegraphie." [67] See British Specification No. 11,348 of 1901. [68] See _Comptes Rendus_, May 21, 1900; Rapports du Congrès International d'Electricité, Paris, 1900, p. 341. [69] See _The Electrician_, Vol. XLVI., p. 573, February 8, 1901. [70] See _The Electrician_, Vol. L., p. 418, January 2, 1903. [71] See Mr. Marconi's Friday evening discourse at the Royal Institution, June 13, 1902; also _The Electrician_, Vol. XLIX., p. 390. [72] See _Proc._ Roy. Soc., June 12, 1902. "A Note on the Effect of Daylight upon the Propagation of Electromagnetic Impulses over Long Distances," by G. Marconi. [73] See _Phil. Mag._, Vol. IV., p. 253, Series 6, August, 1902. J. J. Thomson, "On Some Consequences of the Emission of Negatively-electrified Corpuscles by Hot Bodies." [74] The opinion that ionisation of the air by sunlight is a cause of obstruction to Hertzian waves propagated over long distances has also been expressed by Mr. J. E. Taylor. See _Proc._ Roy. Soc., Vol. LXXI., p. 225, 1903. "Characteristics of Earth Current Disturbances and their Origin." [75] See _Proc._ Roy. Soc., May 15, 1902. "On Some Phenomena affecting the Transmission of Electric Waves over the Surface of the Sea and Earth," by Captain H. B. Jackson, R.N., F.R.S. [76] Mr. Marconi has informed the writer that these strategic questions have received attention in selecting the sites for large Marconi power stations in Italy. * * * * * [Detailed Transcriber's Notes The text has been made to match the original text as much as possible retaining all apparent printer's errors and inconsistencies. The following, detail the apparent printer's errors etc. identified in the original text. Variation in spelling, Strasburg and Strassburg for Strasbourg. There are a number of inconsistencies in hyphenation present in the original text. Those concerned with the variation between one word or a hyphenated word are detailed below. Those concerned with the variation between multiple words and hyphenated words are too numerous to detail individually. Inconsistent hyphenation of word, 'anti-node' and 'antinode' both present in original text. Inconsistent hyphenation of word, 'electro-dynamic' and 'electrodynamic' both present in original text. Inconsistent hyphenation of word, 'horse-shoe' and 'horseshoe' both present in original text.