Thomas McGrory Self-Tying Insulator Patent

Lock Wire Insulator.

We illustrate below the lock wire insulator exhibited at the Philadelphia Electrical Exhibition by Mr. Thomas McGrory, of that city. It is intended to facilitate the holding or locking of telegraph or other wires. The advantages claimed are that it holds the wire securely when once it has been passed through, so that there is neither straining nor slipping out of place; that one man can put up as many wires with this lock system as two men can with the ordinary method of tying or wrapping; that time is saved, and that there is an economy of from 14 to 18 inches of wire on each insulator.

Lock Wire Insulator.