[N310023], Technical Note, Thomas Alva Edison, December 12th, 1885


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[N310023], Technical Note, Thomas Alva Edison, December 12th, 1885

Editor's Notes

telephone (for phonoplex?) Describes experiments to be made with various induction coil and condenser arrangments; followed by these instructions: "Try all these coils, etc at the station on table having two or 3 sets set up and while experiments are being tried on one set another is being got ready Thus with 3 sets or even two the expmts can be made continuous= During the experiments the condenser devices etc for getting rid of induction & also for connecting to the line must remain undisturbed A thorough understanding must be had with the train man so he records the experimenting another man should be with him have a telephone & he should record his impressions of the other man-- The nature of every change made at the secondary station should be teleghd to train so the two person each of whom have a telphone to each can record them & giving their time to record their impressions as to loudness etc= One man should watch the recd at the sending station keeping it at same tone, which he can do by adjusting & using a tuning fork-- After the best form of coil & condenser & battery is obtained-- another trip should be taken using these forms only and variations in the recd & condensers etc gon through to ascertain what improvement can be made in this linne-- Each experiment of coils etc should be numbered & these numbers telegraphed so all thes persons involved record the same experiment,-- After all these experiments & the best form of coils batteries condensers note in recd connection to line--etc you might make 1/2 doz receiving telephones of different resistance & test them"





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