Various light bulb magazine number four the emergency cassette - Incandescent light bulb - Wikipedia


Over the next seven decades, other inventors also created “light bulbs” but no designs emerged for commerical application. More notably, in 1840, British scientist Warren de la Rue enclosed a coiled platinum filament in a vacuum tube and passed an electric current through it. The design was based on the concept that the high melting point of platinum would allow it to operate at high temperatures and that the evacuated chamber would contain fewer gas molecules to react with the platinum, improving its longevity. Although an efficient design, the cost of the platinum made it impractical for commercial production.


Various Light Bulb Magazine Number Four The Emergency CassetteVarious Light Bulb Magazine Number Four The Emergency CassetteVarious Light Bulb Magazine Number Four The Emergency CassetteVarious Light Bulb Magazine Number Four The Emergency Cassette

ie.setouchi-sankan.info