Scientific amusements . a Bobbin ofcoil wire round magnet, i. Dia-phragm, c. Mouthpiece, d. Permanent™gn«. f. Wires to binding Both wires as one for convenience,.r- Adjusting screw-holding magnet. into sound. The accompanying illustrations {see page 182)show Mr. Bells Telephone as described. The Telephone, subsequently simplified by ProfessorBell, is shown in the two following illustrations. The MR. EDTSON. 185 voice strikes against the diaphragm, and it begins tovibrate. The sound is not conveyed by the wire; themotion is communicated, and the vibrations becoine soundwaves again. Th
Scientific amusements . a Bobbin ofcoil wire round magnet, i. Dia-phragm, c. Mouthpiece, d. Permanent™gn«. f. Wires to binding Both wires as one for convenience,.r- Adjusting screw-holding magnet. into sound. The accompanying illustrations {see page 182)show Mr. Bells Telephone as described. The Telephone, subsequently simplified by ProfessorBell, is shown in the two following illustrations. The MR. EDTSON. 185 voice strikes against the diaphragm, and it begins tovibrate. The sound is not conveyed by the wire; themotion is communicated, and the vibrations becoine soundwaves again. The Telephone consists of a cyhndricalmagnet encircled at one end by a bobbin, on which iswound a quantity of fine insulated copper wire. Themagnet and coil are contained in a wooden case, theends of the coil being soldered to thick copper wire,which traverse the wooden envelope, and terminate in. Mode of using the Telephone. the binding screws. In front of the magnet is a thincircular iron plate, in which is the mouthpiece. Thedrawings will explain the instrument. Mr. Edison also invented a Telephone like Grays, andmade the discovery, that when properly prepared, carbon?would change its resistance with pressure, and that theratio of these changes corresponded with the solved the problem of the production of carbon is placed between two plates of platinumconnected in the circuit and near the diaphragm, and 186 SOUND. the carbon receives the pressure from it by means of themouthpiece.
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
