Who invented the telephone?
Yearly Report of the Physical Society at Frankfort, 1860-1861, pp. 57-64, published in 1862.
"On Telephony by means of the Galvanic Current," by Philip Reis:
The extraordinary results in the field of telegraphy have probably often raised the question, If it might not be possible to transmit musical tones themselves to a distance. ... ... ... With the above principles as a foundation, I have succeeded in constructing an apparatus with which I am enabled to reproduce the tones of various instruments, and even to a certain extent the human voice. ... ... As the length of the conducting wire can undoubtedly be made as great as in direct telegraphy, I have called my instrument "telephone." Now in reference to the capabilities of the telephone, it may be stated that I was enabled to render audible to the members of a large assembly (The Physical Society at Frankfort), melodies which were sung (not very loud) into the apparatus in another house (three hundred feet away), with closed doors.