By L. W. Turner (Eds.)

Electronics Engineer's Reference ebook

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Round of the Marconi Company demonstrated valved radio telephony in that year but A. Meissner of Germany was the first to patent the valve oscillator, just a little ahead of several other workers. World War I gave a tremendous impetus to valve development; by 1919 direction finding equipment and relatively low powered radio telephony transmitters were in considerable use by the armed services, while for reception the crystal detector (first used by Dunwoodie in 1906) was commonly used in conjunction with one or two stages of valve amplification, or superseded altogether by the triode detector.

M. has its historical roots in 1902 but there was a long period of neglect until Westinghouse investigated it briefly in the 1920s. A. m. m. K. Television broadcasting This also owes its inception to sound broadcasting although its concept goes back much earlier even than wireless telegraphy. As far back as 1847 practical systems of transmit­ ting still pictures were in being and the wide attention given to the photoconductive properties of selenium in the 1870s brought renewed interest in trying to devise means of transmitting pictures having movement.

S. w. m. d. f. f. f. s. w. b. f. r. f. t. f. f. f. r. 'th root of a mean value of Û factorial p, 1 x 2 x 3 x . . x p b a" _ _ a'a"2\/^\/a i/n a a\$/a

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