[D8955AEF], Letter from George Milton Hopkins to Thomas Alva Edison, December 21st, 1889

https://edisondigital.rutgers.edu/document/D8955AEF

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Title

[D8955AEF], Letter from George Milton Hopkins to Thomas Alva Edison, December 21st, 1889

Editor's Notes

Dear Mr. Edison: I had not difficulty in getting the Phonograph to work as well as it can work with a broken diaphragm. Two or three days since, I asked you by telephone to send me 6 diaphragms and some rubber rings. These have not been received as yet.##I have attached a revolving mirror to the machine and have used the diaphragm cell as a manometric capsule. I get Koenig's flames nicely. I am trying an experiment to determine the personal equation by means of the phonograph. I believe there is a great deal in the phonograph as a scientific instrument.##Could you prepare a few cylinders with certain cords nd scales? If so, I will send the manuscript music.##Please send diaphragms and rings as soon as convenient. Repectfully, Geo M. Hopkins.

Date

1889-12-21

Type

Folder/Volume ID

D8955-F

Microfilm ID

127:518

Document ID

D8955AEF

Publisher

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