[Trade Journal]
Publication: The Commoner and Glassworker
Pittsburgh, PA, United States
vol. 22, no. 21, p. 3, col. 3-4
The Woolbert Insulator.
Henry W. Woolbert, of Pittsburg, has patented a glass insulator comprising two blocks or heads, the upper of which is formed with two incut openings for two wires, and the lower of which is formed with a single incut opening for receving a single wire. Embedded in each block is a woven wire frame and wires or metal strips. The blocks are secured to a glass arm in which sustaining wires or metal strips are placed. The device employed for securing the blocks is a screw threaded glass bolt, through which wires or metal strips are passed.
By this construction the metal supporting devices are completely insulated from the electric wire. Should any of the glass parts be broken or cracked, the supporting devices will still hold them together.
