[D8107E], Letter from James A Campbell to Thomas Alva Edison, January 20th, 1881

https://edisondigital.rutgers.edu/document/D8107E

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Title

[D8107E], Letter from James A Campbell to Thomas Alva Edison, January 20th, 1881

Editor's Notes

About to issue a work on mechanical hearing aids. Want sources for learning about your investigations in this line. Can principles of telephone be applied to defective hearing? Saw in 1878 clipping that Bell predicted possibility of hearing fall of shadow on a section of selenium in telephone circuit; is this true? [Mostly illegible TAE marg]

Date

1881-01-20

Type

Folder/Volume ID

D8107-F

Microfilm ID

57:398

Document ID

D8107E

Publisher

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