[MBN002054], Technical Note, Charles Batchelor, February 4th, 1878
https://edisondigital.rutgers.edu/document/MBN002054
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Title
[MBN002054], Technical Note, Charles Batchelor, February 4th, 1878
Editor's Notes
battery designed to vary resistance with action of human voice either by pressure or by increase of surface of one pole; switch for induction coil on telephone; check stamping machine
Author
Date
1878-02-04
Type
Folder/Volume ID
MBN002-F
Microfilm ID
90:684
Document ID
MBN002054
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University