Manuscripts/Mixed Material Script by Thomas A. Watson, December 21, 1914
Watson. I remember how excited you were and how eagerly you questioned me and examined the instruments in my charge.
Bell. I found that one of your receiver springs had become so strongly magnetized that it had adhered to the pole of its magnet and that you had snapped it several times in order to set it free to vibrate.
Watson. Yes. I was thoroughly disgusted with the way those bothersome things were working that hot afternoon and when that thing stuck I had given it some very vicious snaps when you came rushing through the door in great excitement.
Bell. No wonder I was excited! Never before that moment had a real sound been transmitted and heard electrically. The sticking of that receiver spring had solved the problem I had been struggling with so long. That thin strip of magnetized steel set into vibration over the pole of its electromagnet by your snapping had generated an electric current that realized fully my theory of the telephone which, as you remember, was, that I would be able to talk by telegraph if I could find a means by which I could make a current of electricity