| This is a prototype style produced by Hemingray in c.1910 for an experiment with AT&T to design a new standard insulator. The CD 157 No.38 and the CD 152 No.40 were also candidates. The CD 152 won out, and only about five or six of this style are known to have survived the various "stress tests" to which these insulators were subjected.
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| Dimensions: |
3 5/8" H x 3 1/4" W |
Primary
Embossing: |
HEMINGRAY
|
Years Produced: |
c.1910 |
| Style Number: | Type I | |
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