. Annual report of the Board of Regents of the Smithsonian Institution . honic contact type. In 1900« Marconi substituted for the plain aerial an aerial withthe writers tuned local circuit or tank circuit for sending, thus ob-taining a considerable increase in range of transmission. In 1902 Marconi invented a very ingenious form of current-oper-ated receiver, called the magnetic detector, and with this combinationachieved some very remarkable results. « Lodge, Great Britain jiatent No. 11575, May 10, 1897. 6 Marconi, Great Britain patent No. 1232G, June 1, 1898. Official report United States N
. Annual report of the Board of Regents of the Smithsonian Institution . honic contact type. In 1900« Marconi substituted for the plain aerial an aerial withthe writers tuned local circuit or tank circuit for sending, thus ob-taining a considerable increase in range of transmission. In 1902 Marconi invented a very ingenious form of current-oper-ated receiver, called the magnetic detector, and with this combinationachieved some very remarkable results. « Lodge, Great Britain jiatent No. 11575, May 10, 1897. 6 Marconi, Great Britain patent No. 1232G, June 1, 1898. Official report United States Navy of test U. S. S. Massachusetts, October,1899. <* Lodge, Muirhead & Robinson, Great Britain patent No. 13521, June 14, 1902. ^ Brown & Neilson, Great Britain patent No. 28955, December 17, 1896. f A. Neugschwender, Wied. Ann. der Pliysil^, 1899, voL 67, p. 430. Seliaefer,British patent No. 6002, 1899. - Marconi, Great Britain i)atent No. 7777, April 26, 1900. Marconi, Great Britain patent No. 10245, 1902. Smithsonian Report, 1908.—Fessenden. Plate 1,. Fig. 1.—Preliminary Dynamo, 1 Kilowatt, 10,000 Cycles.
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