[NS86ADC], Technical Note, Thomas Alva Edison, John F Ott, February 20th, 1886


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[NS86ADC], Technical Note, Thomas Alva Edison, John F Ott, February 20th, 1886

Editor's Notes

[unclear if this is part of NS86ADC1] Try this [drawing] X is a yoke that work on the end of the sounder lever & is held by friction when the lever comes down the points on the yoke strike both of he screws at the same time and leave at the same time Thus the spark on each oint is 1/4 what it wiould be on one point the circuit being borken in two places at the same time. What I want to find out is if I can dispense with the Condenser around the points if I break the circuit in two or more places at the same time-- If I can't perhaps I can reduce the amount required of Condenser. Don' you remember down at Goerck St we made a sounder that brok the circuit in 4 places at the same time It was made like this [drawing] If the two points shows up better with out a condenser than a single point yo better make me one with 4 points top & bottom also make a 7 ohm coil Thus= [drawing] where the wood is there are no lines of force and the wire does no good Try and work up a good low Resistance Callaud for phonoplex T A Edison <Finished Experiment Monday March 1, 86 [Ott]>




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