To develop lamp, Edison is often in the laboratory work 10 hours a day, sometimes several days of testing, after the invention of carbon filament as the filament, he tested a series of more than 6000 kinds of plant fibers, and finally selection of bamboo, enclosed by high temperature furnace burning, and then processed to be carbonized bamboo, installed into the bulb, and again raised the vacuum light bulb, lamp went so far as 1200 hours continuous lighting. The invention of electric light has enabled the Gas Company shares plunged 12 percent within 3 days.

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