Conversation so far:
When did Bell begin Alexander Graham Bell's early work on the telephone?
By 1874, Bell's initial work on the harmonic telegraph had entered a formative stage.
what led to his discovery of the telephone?
Bell experimented with a "phonautograph", a pen-like machine that could draw shapes of sound waves on smoked glass by tracing their vibrations.
What was happening at the time of his discovery?
In 1874, telegraph message traffic was rapidly expanding and in the words of Western Union President William Orton, had become "the nervous system of commerce".
What can you tell me about his discovery of the "telephone"?
On June 2, 1875, Watson accidentally plucked one of the reeds and Bell, at the receiving end of the wire, heard the overtones of the reed.
What did Bell do from there?
CANNOTANSWER.
Are there any other interesting aspects about this article?
In March 1875, Bell and Pollok visited the scientist Joseph Henry.

Question: What happened at that meeting?
Self-contained rewrite: What happened at the meeting of Bell and Pollok and the scientist Joseph Henry?