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 55
58 All About the Telephone that of the ferrotype plate used by photographers, which is almost the thinnest procurable, and thin tin¬ plate is also available. The plate is cut into a disc, about two inches in diameter (in the instruments in ordinary use, but may be much larger), and is placed as… … TJS1XG THE TELEITIOXE. steel magnet without touching it; the effect of this position being that, while the induced magnetism of the plate is considerable, it is susceptible to very rapid changes, owing to the freedom with which the plate can vibrate. The dimensions given are those of the instrument…
Telephone · Popular works · Phonograph · Telephone -- Popular works · Phonograph -- Popular works
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