[D8133ZAV], Letter from Edward Hibberd Johnson to Thomas Alva Edison, November 19th, 1881

https://edisondigital.rutgers.edu/document/D8133ZAV

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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.

Date

1881-11-19

Decade

1880-1889

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
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