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The rapidity of the several instruments in use may be given as follows: Cooke and Wheatstone's needle telegraph of Great Britain, 900 words per hour; Froment's dial telegraph, of France, 1200; Bregnet's dial telegraph, also French, 1000; Sieman's dial telegraph, formerly used upon the Prussian lines, 900; Bain's chemical, in use between Liverpool and Manchester, and formerly to a considerable extent in the United States, 1500; the Morse telegraph, in use all over the world, 1500; the House printing, used in the United States to a limited extent, and in Cuba, 2800; Hughes's and the combination instruments, 2000.
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