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Glass Strain Insulators |
Although all relatively uncommon, there are a variety of glass strain insulators available. These were typically used to insulate a telephone or power pole guy wire from ground. This was done to protect from inductance causing a charge on the wire as well as to prevent galvanic affects from corroding the guy wires and anchor. The North American versions of these have been assigned CD numbers in the 1130 to 1142 range. I do not believe any numbering system has been devised for strain insulators from outside North America.
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Here is a glass strain known as a "johnny ball" due to its shape. Both Hemingray and Brookfield were known to have made these styles, but none are marked. |
End view of a glass johnny ball style strain. |
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