[34] See The Electrician, Vol. XL., p. 90. Sir Oliver Lodge, "The History of the Coherer Principle."
[35] See Professor E. Branly, "A Sensitive Coherer," Comptes Rendus, Vol. CXXXIV., p. 1,187, 1902; or Science Abstracts, Vol. V., p. 852, 1902.
[36] This device of making the inter-electrode gap in a tubular filings coherer wedge-shaped has been patented again and again by various inventors. See German patent No. 116,113, Class 21a, 1900. It has also been claimed by M. Tissot.
[37] See The Electrician, Vol. XXVII., 1891, p. 448.
[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.