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This is an excerpt from the 1907 Western Electric catalog showing Span Wire Insulators.
|Wt. per 1000
|Span wire (Old No. 10)
Span wire (Old No. 15)
| 11 ozs.
17 1/2 ozs.
| 720 lbs.
Today #90 is assigned CD 1138 and #91 CD 1140. Both of these insulators were made by Hemingray and Brookfield and these in catalogs from about 1900 to 1920. They are all unembossed, despite the apparent embossing on the item above, which is recolored from the original black and white copy. The Brookfield catalog of 1912 called these "Circuit Breaker Insulators". They are also known as guy strains and "Johnny Balls" (the later a nickname used in the insulator hobby)
Catalog pages courtesy of Elton Gish and the IRS.
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Last updated Sunday, February 16, 2003