English Crighton screw-top insulator

IMPROVED INSULATOR.

The insulator illustrated is of the form most used by the Postal Telegraph Department in England. In this the porcelain cup is grooved, and the telegraph wire held by binding wire firmly attached to it and passing round this groove.

Fig. 1 - Ordinary English Porcelain Insulator.

This binding takes some time and in some districts the binding wire is rapidly corroded and the attachment destroyed. In the new insulator - the invention of Mr. C.E. Crighton, of Newcastle - the porcelain cap is made in two

Fig. 2 - Crighton's Improved Insulator.

Parts, A and B. The upper part of A is slotted and screwed, as shown by detached sketches, and a strong porcelain cap, B, screws thereon. The telegraph wire, W, is simply dropped into place, the serrated steel wedge, E, dropped into

Fig. 3

The slot, and the cap screwed in. The wire by this means held so tight that the ordinary lengths may be suspended by its grip.