Appletons' cyclopædia of American biography . of transmitting messages be-tween his fathers home in Port Huron and the houseof a neighbor. Finally a station-master, whose childhe had rescued in front of a coming train at therisk of his own life, taught him telegraph operating,and he wandered for several years over the UnitedStates and Canada, acquiring great skill in this art,but frequently neglected his practical duties forstudies and experiments in electric science. Atthis time he invented an automatic repeater, bymeans of which a message could be transferredfrom one wire to another without
Appletons' cyclopædia of American biography . of transmitting messages be-tween his fathers home in Port Huron and the houseof a neighbor. Finally a station-master, whose childhe had rescued in front of a coming train at therisk of his own life, taught him telegraph operating,and he wandered for several years over the UnitedStates and Canada, acquiring great skill in this art,but frequently neglected his practical duties forstudies and experiments in electric science. Atthis time he invented an automatic repeater, bymeans of which a message could be transferredfrom one wire to another without the aid of anoperator, and in 1804 conceived the idea of sendingtwo messages at once over the same wire, whichled to his experiments in duplex telegraphy. Laterhe was called to Boston and placed in charge ofthe crack Xew York wire. While in that cityhe continued his experiments, and perfected hisduplex telegraph, but it did not succeed till IS came to Xew York in 1871, and soon afterwardbecame superintendent of the gold and stock com-. a& U>o-y\ 804 EDMONDS EDMUNDS (vinv, inventing the printing telegraph for goldand stock quotations. For the manufacture o\ thisappliance he established a large workshop at New-ark. N. J., and continued there till 1876, when heremoved to Menlo Park, X. J., and thenceforth de-l his whole attention to inventing, Amonghis principal inventions are his system of duplextelegraphy, which he subsequently developed intoquadruples and. sextuple* transmission; the car-bon telephone transmitter, now used by nearly alltelephones throughout the world, in which thea ion in the current is produced by the variable s stance of a solid conductor subjected to press-ure, rendering more faithfully than any othertelephone the inflections and changes in the inten-sity of the vocal sounds to be transmitted; themi-crotasimeter, used for the detection, on the sameprinciple, of small variations in temperature, andsuccessfully employed during the total eclipse of187
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