[D8326N], Letter from Charles Schenck Bradley to Thomas Alva Edison, July 22nd, 1883
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Title
[D8326N], Letter from Charles Schenck Bradley to Thomas Alva Edison, July 22nd, 1883
Editor's Notes
How would it do to take some iron from the large pole pieces on the large dymamo to prevent the sparking of Brushes [drawing]? Suggests that there's a short in the magnetic circuit between tips of pole pieces that "develops a tension between any two armature bars as they come opposite, and this being the location of the brushes on the commutator produces sparking." Expounds somewhat on this theory; thinks the new H machine gives proof of its correctness. Suggesting that pole pieces come to a point in order to concentrate lines of force [which he argues happens in the small machines by the high speed of rotation.] You amy have thought of this long ago but yu have too many duties to give it real thought. TAE marg: "Say to B that it would be troublesome and costly to do Am tryting yo do it with brushes themselves"
Author
Recipient
Date
1883-07-22
Type
Folder/Volume ID
D8326-F
Microfilm ID
66:680
Document ID
D8326N
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University