A Comparison of three M-3490 Multipart Insulators

By Dale Nielson; posted January 4, 2015

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These M-3490's were made by Thomas, Locke (Victor), and Pittsburg. The main differences are seen in the features of the crowns. Their weights are nearly identical, all at 21 lbs. +/- 1 oz.

All three were removed from the same hydro-electric power line in southeast Idaho.