[NM020AAS], Technical Note, Thomas Alva Edison, February 28th, 1886


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[NM020AAS], Technical Note, Thomas Alva Edison, February 28th, 1886

Editor's Notes

[Drawing] (Triphonoplex) Hows that ? Dyer Take out patent on this In addition to regular phonoplex I add another receiving phone just the same as the phonoplex phone except it has a light weight and has an upward limiting nut so the diaphragm cant throw it up more than 1/1000 of inch-- This weight respons to the rapid vibration thrown on the wire by a local self make & break telephone diaphragm X C is a 7 ohm primary coil= when key N is closed the diaphragm vibrates as it leaves self mks & bks, this causes the coil to send a wave= The phonoplex phone is prevented from responding by being shunted with a small condenser which nearly wipes out the rapid [occurring?] but weak vibrations of the harmonic & in addition is provided with so heavy a weight that while the strong phonoplex waves lifts it no single harmonic wave as the strength. Thus I get 3 messages over a way wire. T A Edison




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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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