Publication: Scientific American
New York, NY, United States
A NEW FORM OF INSULATOR.
Insulators made of glass or other fragile material often fall apart when broken and drop the wire. To remedy this evil. Henry W. Woolbert, Box 690, Pittsburg, Pa., 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 receiving 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.