If you look at any urban or suburban city street photo from the 1910's there is a good chance you will see one of these magnetite lamps suspended from a power pole or lamp post. They were once as much a part of the fabric of every day city life as the glass insulators we collect. Today there are no surviving operational examples of these lights left and virtually none even survive in museums. Each lamp had about 6 pounds of copper and brass in it . The outer shell was sheet copper and the inner workings has allot of brass and copper as well. Since the metal was needed for the world war 2 effort they were rapidly replaced with cheep incandescent fixtures. Since all of them were owned by utility companies and cities no one saved or preserved them. They have literally become an extinct technology.[618977209]