Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 629
Fig. 471. 6io ELECTROMAGNETIC INDUCTION, … Fig. 472. 699. The Telephone. The telephone, invented by Bell in 1876,consists of a thin iron plate or membrane, supported in front ofthe pole of a permanent magnet, and a spool of wire over themagnet pole (Fig. 472). Sounds can be transmitted electricallyto a distance by using two telephones, one…
Physics
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-128-41.webp)
