In this experiment, made on the 9th of October, 1876, actual conversation, backwards and forwards, upon the same line, and by the same instruments reciprocally used, was successfully carried on for the first time upon a real line of miles in length.
It is not, of course, complete yet - but some sentences were understood this afternoon... I feel that I have at last struck the solution of a great problem - and the day is coming when telegraph wires will be laid onto houses just like water or gas - and friends converse with each other without leaving home.
Such a chimerical idea as telegraphing vocal sounds would indeed, to most minds, seem scarcely feasible enough to spend time in working over. I believe, however, that it is feasible and that I have got the cue to the solution of the problem.