PROFESSOR A. GRAHAM BELL’S DISCOVERY—SUCCESSFUL AND INTERESTING
EXPERIMENTS—THE RECORD OF A CONVERSATION CARRIED ON BETWEEN BOSTON AND
CAMBRIDGEPORT.
The following account of an experiment made on the evening of October 9
by Alexander Graham Bell and Thomas A. Watson is interesting, as being
the record of the first conversation ever carried on by word of mouth
over a telegraph wire. Telephones placed at either end of a telegraph
line owned by the Walworth Manufacturing Company, extending from their
office in Boston to their factory in Cambridgeport, a distance of about
two miles. The company’s battery, consisting of nine Daniels cells, was
removed from the circuit and another of ten carbon elements substituted.
Articulate conversation then took place through the wire. The sounds, at
first faint and indistinct, became suddenly quite loud and intelligible.
Mr. Bell in Boston and Mr. Watson in Cambridge then took notes of what
was said and heard and the comparison of the two records is most
interesting, as showing the accuracy of the electrical transmission:—