Carbon Button Lamp: Most Up-to-Date Encyclopedia, News & Reviews
Popular science monthly . with heavy asbestos paper. The springsare connected in series with each otherand the lamp carbon circuit. They aremounted with sufificient tension to openthe spring far enough to prevent
Photos of Experimental Tesla Carbon Button Lamp - G.G. Brock Laboratories
Tantalum-filament lamp, a sample of the element Tantalum in the Periodic Table