[D8133ZAV], Letter from Edward Hibberd Johnson to Thomas Alva Edison, November 19th, 1881
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Title
[D8133ZAV], Letter from Edward Hibberd Johnson to Thomas Alva Edison, November 19th, 1881
Editor's Notes
Sends copy of blue book Brush's patent in which he disclaims electroplating carbons. Calls TAE's attention to his method of maintaining field by "derived ckt. I thought this was old & everyone could use it." Asks if TAE planning to use derived ckt in central station plant; Johnson is under impression he doesn't. Shld we oppose Brush's patent, or let others do so? After all we have good relns w/ Brush, so recommends not. Cable me "Oppose Brush" if you think opposite. Johnson's recollection is that TAE excites field w/ separate machine. [I guess derived ckt is a form of self-excitation.] If so, hw ensure reliability, if exciting engine or dynamo fails? This cld take dn entire plant.
Author
Recipient
Mentioned
Date
1881-11-19
Type
Folder/Volume ID
D8133-F
Microfilm ID
58:716
Document ID
D8133ZAV
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University