Manuscripts/Mixed Material Script by Thomas A. Watson, December 21, 1914
Watson. Your excitement drove the tired feeling out of me and you kept me plucking springs and making various combinations all that afternoon. Just before we finished work that night you made a rough sketch of the first speaking telephone which I was to construct as soon as I possibly could.
Bell. This is a model of that very instrument. I directed you to take one of the harmonic receivers and attach a drumhead to the free end of its spring. I was sure that when I talked against that drum head the spring attached to it would be forced to follow the vocal vibrations and transmit speech tones instead of merely its own twang.
Watson. I carried out your ideas and had the first telephone ever made ready for trial the next day. Its test proved that your theory was correct. The telephone was horn June 2, 1875. You made many modifications of it during the next two years but all your experimenting after the date of the discovery was really a matter of working out the best forms of its details.
Bell. Another great day in the history of the telephone was Oct. 9th, 1876 when I felt I had my telephone working well enough to try it on a real live wire. Do you remember that evening?