ith having obtained the idea from him through
the medium of a mutual friend.

A still more powerful form of apparatus was constructed by using a
powerful compound horseshoe magnet in place of the straight rod which
had been previously used (see Fig. 11). Indeed, the sounds produced by
means of this instrument were of sufficient loudness to be faintly
audible to a large audience, and in this condition the instrument was
exhibited in the Essex Institute, in Salem, Massachusetts, on the 12th
of February, 1877, on which occasion a short speech shouted into a
similar telephone in Boston sixteen miles away, was heard by the
audience in Salem. The tones of the speaker's voice were distinctly
audible to an audience of six hundred people, but the articulation was
only distinct at a distance of about six feet. On the same occasion,
also, a report of the lecture was transmitted by word of mouth from
Salem to Boston, and published in the papers the next morning.

From the form of telephone shown in Fig. 10 to the present form of the
instrument (Fig. 12) is but a step. It is, in fact, the arrangement of
Fig. 10 in a portable form, the magnet F. H. being placed inside the
handle and a more convenient form of mouthpiece provided....

It was always my belief that a certain ratio would be found between the
several parts of a telephone, and that the size of the instrument was
immaterial; but Professor Peirce was the first to demonstrate the
extreme smallness of the magnets which might be employed. And here, in
order to show the parallel lines in which we were working, I may mention
the fact that two or three days after I had constructed a telephone of
the portable form (Fig. 12), containing the magnet inside the handle,
Dr. Channing was kind enough to send me a pair of telephones of a
similar pattern, which had been invented by experimenters at Providence.
The convenient form of the mouthpiece shown in Fig. 12, now adopted by
me, was invented solely by my friend, Professor Peirce. I must also
express my obligations to my friend and associate, Mr. Thomas A. Watson,
of Salem, Massachusetts, who has for two years past given me his
personal assistance in carrying on my researches.

In pursuing my investigations I have ever had one end in view--the
practical improvement of electric telegraphy--but I have come across
many facts which, while having no direct bearing upon the subject of
telegraphy, may yet possess an interest for you.

For