Security knob illustrated
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[Trade Journal] Publication: Western Electrician Chicago, IL, United States |
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New Porcelain Insulator.
The accompanying cut illustrates a new porcelain insulator placed on the market by the Security Insulator company of New York. The device obviates the necessity of using a tie wire, the wire being pressed into a groove by a cap, which by a cam movement, is made to grasp and hold the wire securely. By this arrangement wires of varying sizes can be used, the cam motion allowing a variation of one-quarter of an inch. The time consumed in running wire by the use of this insulator, it is claimed, is reduced materially.
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