Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 646
is the permanentbar magnet of steel with one pole towardsthe vibrating plate or diaphragm D, whichis of very thin iron. On the end of themagnet next the diaphragm is the coil of wire C, whoseends are connected to the outside terminals TT;. In order to telephone, two such instruments may beconnected…
Sound
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