- Carbon button lamp
The carbon button lamp is a single-
electrode incandescent lampinvented by Nikola Tesladuring his effort to get around the Edison patentfor the incandescent light bulb. A carbon buttonlamp contains a small carbon sphere positioned in the center of an evacuated glass bulb. This type of lamp must be driven by high-frequency alternating current, and depends on an electric arcor perhaps a vacuum arcto produce high current around the carbon electrode. The carbon electrode is then heated to incandescence by collisions by ions which constitute the electric current. Tesla found that these lamps could be used as powerful sources of ionizing radiation.
List of light sources
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