[D8944AAN], Letter from Thomas Alva Edison to Henry Villard, October 18th, 1889
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Title
[D8944AAN], Letter from Thomas Alva Edison to Henry Villard, October 18th, 1889
Editor's Notes
[This is Edison's draft of LB033174A 891018] Henry Villard Presdt Dear Sir The trouble in the Sprague armature is not due to the winding.##Previously the burning out##troubles occurred in the field magnet and not in the armature to rectified this trouble. Copper [babbins?] placced in the iron magnet was adapted. This diminished the Counter Electromotivve forcce at any one moment so derived from the charge or disccharge of the magnet that the disruptive charge was prevented, But it was this very change which saved the armature and now being done away with the whole of the current comes to the armature like a cannon ball unchecked by the back current of the field the consequence is that with heavy loads on grades the armature must been out even if wound with absolute perfection. Yours Truly TAE
Supplied year, month, and day
Author
Recipient
Mentioned
Date
1889-10-18
Type
Subject
Folder/Volume ID
D8944-F
Microfilm ID
78:534
Document ID
D8944AAN
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University