Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 1028
Fig. 980 other is used for speaking into ; the latter beinthan the receiver. The action of the instrument depends on the production and variationof electric currents, in the circuit consisting of the two instruments andthe connecting wires, by variation of electromotive force, the resistance in…
Physics
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-663-425.webp)
