author - "Herbert N. Casson"

arch. Already, for half a yearor longer, Bell had known the correct theory ofthe telephone; but he had not realized that thefeeble undulatory current generated by a magnetwas strong enough for the transmission of speech.He had been taught to undervalue the incredibleefficiency of electricity.Not only was Bell himself a teacher of thelaws of speech, so highly skilled that he wasan instructor in Boston University. His father,also, his two brothers, his uncle, and hisgrandfather had taught the