In 1809, and English chemist called Humphry Davy invented the first electric light. He used several wires, a battery, and a charcoal trip to connect the circuit, and the first arc lamp was invented by the glowing of the charged carbon. In 1820, another man called Warren De La Rue who was a British astronomer also a chemist designed a new type of lamp, but the cost of the instruments caused this become and impossible invention for widespread use. In 1850, Edward Shepard used a charcoal filament to make an electrical incandescent arc lamp and it was successful. At the same time, Joseph Wilson Swan was trying to use carbonized paper filaments. In 1854, in Germany, a watchmaker called Henricg Globel used a carbonized bamboo filament and invented the first true light bulb which was made by glasses. In 1875, a Canadian named Henry Woodward and his partner Matthew Evans patented and improved the electric light bulb. In 1876, a Russian electrical engineer Pavel Yablochkov invented the first practical carbon arc lamp that he named it “Yablochkov candle”. It was used for public street lighting in Paris. In 1878, a practical and longer-lasting electic lightbulb was invented by an English physicist----Sir Joseph Wilson Swan. In 1879, Thomas Alva Edison invented a filament which was made of carbon that burned for 40 hours and he used an oxygenless bulb to place this filament. He also purchased the patent from Henry Woodward and Matthew Evans. (Therefore, people all think he invented the light bulb) In 1880, Edison produced a 16W light bulb that could last for more than 1200 hours. In 1897, Walther Nernst invented an incandescent lamp that based on solid-state electrolytes. In 1925, the first frosted light bulbs were born. A light bulb that lasted 60,000 hours by using magnetic induction was invented by Philips in 1991.