Insulator glass was used to insulate the wires on telegraph poles used alla cross the US. The glass comes in many colors which indicates where the glass was manufactured. Some glass is very common, but others are quite rare and can fetch many thousands of dollars. Stanley Hammel collects this kind of glass, and displays his less expensive pieces on telephone & telegraph poles mounted all around his property. The more expensive pieces of his collection are kept safe inside.
The Glass Insulator House