I'm reading a book called "Telephony" published in 1905 (Miller,Mcmeen).
The book starts with this quote:
To properly understand the manner in which sound is transmitted from one end of an electric circuit to the other, it will be necessary to entirely get rid of a popular idea, and to fix clearly in mind, that the sound produced at one end of a circuit actually travels over that circuit, in order to be heard at the other end.That is erroneous; in reality the actual sound produced at one end of the circuit, travels no farther than it would if the telephone apparatus were not present. What actually take palce instead may be described as follows: The sound energy produced in the presence of the telephone apparatus is transformed by the apparatus in electric energy, which, traveling to the distant end of the line, is again retransformed by the distant apparatus into sound energy.
I don't understand the point.
What is the misconception they're trying to address?