lecto-Watt Hour

—A unit of electrical | Helion Lamp.—A type of incandescent work equal to 100 watt hours. lamp having a filament composed of a core of carbon which has been treated with a gaseous compound containing silicon. The metal enters the carbon and at the same time forms a surface deposit. The filament is strong, will withstand much higher temperatures than carbon, consumes le watts per candle power, and gives a white light resembling daylight.