[LB015423], Letter from Thomas Alva Edison to Edward Hibberd Johnson, March 6th, 1883
https://edisondigital.rutgers.edu/document/LB015423
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- Title
- [LB015423], Letter from Thomas Alva Edison to Edward Hibberd Johnson, March 6th, 1883
- Editor's Notes
- You say in your letter to Maj Eaton that Hopkinson telegraphs from Manchester that he gets 100 lights out of Z machines. You know we frequently run it at 90 and the Lamp Factory does it for hours. If you take a B. armature and run at 1200 [s---] and put in a seven inch core instead of six inch and either connect the wire on field for B. or wind other wire on so as to pass more current or if you [---k] an eight inch core using regular current and 90 to 93 volts A lamps you can run 100 easily but there isnt much margin of volts to make a loss on house wiring. If he gets 100 lamps 16 candles see if he does not [have] [---] volts and has no volts to spare for drop in conduction##With double 6 inch fields on Z & B Armatures wound to make it still lower resistance you can get 125 with 92 Volt A lamps. The same with the others. But you know that it is not well to force a machine and leave no margin for [paths] [ca-----].##Our new [K] is good for 400 lamps same as previously used in England and 350 new Isolated [very] [easy] but I will not permit our people to [use] it for more than a 325 light machine. All machines should have 1/3 for margin and volts enough to make a loss of at least 10 per cent on the mains.
- Author
- Edison, Thomas Alva
- Recipient
- Johnson, Edward Hibberd
- Date
- 1883-03-06
- Type
- Letter
- Subject
- Dynamos and generators
- Folder ID
- LB015-F
- Microfilm ID
- 82:209
- Document ID
- LB015423
- Publisher
- Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
- License
- CC0 1.0 Universal
- Has Version
- Archive.org Viewer, Microfilm Series Reel 82
- Item sets
- [LB015-F] LB-015 (1882-1883)