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