The Voice by wire and post-card. All about the telephone and phonograph : containing description of Bell's and Dolbear's telephones and Edison's phonograph .. (1875)
Wykes, W.M. · London : Ward, Lock and Co. ... · leaf 61
All About the Telephone 64 may be from the one-twentieth to the one-fiftieth of an inch in thickness. It does not seem to make much difference about the thickness of this plate. I have generally got the best results from a plate one- fiftieth of an inch thick. The upright board carrying this plate… … DOLBEAIl’s TELEPHONE (Fig1. 2). plate shall be as close as possible to the magnet ends, but not to touch : therefore fix the board tight, and adjust the magnets by means of the button shown on top of them in the perspective figure. The sounds to be transmitted, of whatever sort they may be, are to…
Telephone · Popular works · Phonograph · Telephone -- Popular works · Phonograph -- Popular works
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
