[N086047], Technical Note, Charles Batchelor, October 15th, 1879
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Title
[N086047], Technical Note, Charles Batchelor, October 15th, 1879
Editor's Notes
35 telephones Nos. 85-119 inc sent to London today IN testing them we find them all a little lower than they ought to be but very good. We sent 23 on Oct 9th which were all low on testing but when we put in the ribbed spring they all belched right out [with drawing of spring] We cannot at prsent account for the fact that these 35 are a little lower than standard. fr. 943 We pressed some chalks from new mould (that is the one made for the msall chalks) and in order to get the right pressuure we took a chalk moulded in large mould and turned the diameter to fit the small mould and weighed the chalk -- testing pressure expts
Author
Date
1879-10-15
Type
Subject
Folder/Volume ID
N086-F
Microfilm ID
35:942
Document ID
N086047
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University