Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 582
ld make the ground-wires unnecessary, but this this movement must set the air against the plate in would use up too much wire.) The magnet and motion in sound-waves corresponding exactly with the coil you will have to buy from some dealer in HOW TO MAKE A TELEPHONE. 551 electrical apparatus. They… … phragm. For a mouth-piece use a small can,such as ground spices come in, or even a roundpaper box. Now, on the inside of the box, place the magnet,the end carrying the coil almost touching the mid-dle of the diaphragm, and fix it firmly. Then, tothe ends of the copper wire of the main coil…
Children's literature
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