Edwin Clark patented improved insulator

IMPROVED INSULATORS FOR

TELEGRAPH WIRES.

MR. EDWIN CLARK has recently introduced an improvement in insulating telegraph wires, according to which the arms and the caps, by which the suspension above the earth is accomplished, in place of being made separate in each case, are made of one piece of metal or other suitable material, and the cap and arm is made with a gutter to carry off rain from above the insulator, which is suspended within the cap.

Fig. 1 shows a side view, partly in section, of one form given by him to the arms and cap; Fig. 2 shows a side view, partly in section, of another form. The forms of the arms and the caps may be varied so long as an arm and cap is in one piece, as shown. a, a, are the metal arms, terminating with inverted hollow metal caps of a suitable form for receiving the earthenware or glass insulator for suspending the wires. The caps are made with gutters around them, as shown. The arms and inverted hollow caps are best made of one piece of cast iron, though wrought iron or other metal may be used, and even earthenware might be employed.