[D7838ZEW], Letter from Gold and Stock Telegraph Co, George S Ladd to Thomas Alva Edison, September 28th, 1878
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Title
[D7838ZEW], Letter from Gold and Stock Telegraph Co, George S Ladd to Thomas Alva Edison, September 28th, 1878
Editor's Notes
of 100 carbon buttons sent about 40% ok for use, one half of those being slightly damaged, have found no difficulty in making them here [SF] by pressing powdered carbon into place in phones rather than making first in a mold, Walker writes that Phelps and Bentley find buttons made out of gas coke work well as the composition and are indestructible
Recipient
Date
1878-09-28
Type
Folder/Volume ID
D7838-F
Microfilm ID
19:772
Document ID
D7838ZEW
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University