[LB015423], Letter from Thomas Alva Edison to Edward Hibberd Johnson, March 6th, 1883
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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
Recipient
Mentioned
Date
1883-03-06
Type
Subject
Folder/Volume ID
LB015-F
Microfilm ID
82:209
Document ID
LB015423
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University