St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 100
a regular transmitter, andFig. 128 a form of compound magnet frequently used inthe transmitter.Fig. 129 showsa transmitterwith cords whichcontain flexiblewires. 121. The Re-ceiver, for shortlines, may havethe same con-strudlion as theBell transmitter.Fig. 130 showsa diagram of twoBell receivers,… … Fig. 131. 98 HOW THE TEI.EPHONK TRANSMITS SPEECH. ternately strengthens and weakens the magnetic fieldnear the diaphragm, causing it to vibrate back and forthas the magnet pulls more or less. The receiver dia-phragm repeats the vibrations in the transmitter. / ]X. M^ aaC ^ Fig. 132. Nothing but the…
Electricity
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