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He passed an electric current through a strip of platinum and made it glow.
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He invented an arc lamp using carbon rods but the light was way to bright.
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He used a platinum coil enclosed in an evacuated tube to carry an electric current. The lamp worked well but the cost of platinum made this impractical.
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He developed a prototype lightbulb to demonstrate a constant electric lighting system.
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British scientist, enclosed platinum in a vacuum tube creating a functional lasting light bulb but the high price of platinum made it hard.
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He was granted the world's first patent for an incandescent lamp, using powdered charcoal heated between two platinum wires contained within a vacuum bulb.
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He created an electrical incandescent arc lamp that uses a filament made of charcoal.
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He demonstrated the first perfected incandescent light bulb.
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A German inventor, developed the first modern lightbulb.
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They patented their version of the lightbulb.
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A physicist from England, invented a practical light bulb that lasted 13.5 hours using a carbon fiber filament made of cotton. He got a UK patent for his improved incandescent lamp inside a vacuum tube.
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He invented a carbon filament that burned for forty hours. Edison placed his filament in an oxygenless bulb.
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He continued to improved his lightbulb until it could last for over 1200 hours using a bamboo-derived filament.
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He invented a filament that would not make the inside of a lightbulb turn dark. It was a metal-coated carbon filament
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They were the first to patent a method of making tungsten filaments for use in incandesent lightbulbs. The filaments were costly.
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He invented an improved method of making tungsten filaments. The tungsten filament outlasted all other types of filaments and Coolidge made the costs practical.
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The first frosted lightbulbs were produced.
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He invented a lightbulb that lasts 60,000 hours. The bulb uses magnetic induction.
