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Scientific American, Vol. 39, No. 8 (1878) (1878)
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ries at least, We have received through the kindness of Mr. James M. And in England especially the iron ship building interest has been employed to direct sound so that it may be heard Wilson, U. S. Consul at Nuremberg, a finely illustrated de- seeks for a machine made tapering iron tube for masts… … EDISON'S MEGAPHONE. © 1878 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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