After summing up the failure experience of his predecessors in manufacturing electric lamps, Edison formulated a detailed test plan and conducted tests in two aspects: one was to classify and test more than 1,600 different heat-resistant materials; the other was to improve Evacuate the device so that the bulb has a high vacuum. He also conducted research on new generators and circuit branching systems.

Edison tested more than 1,600 heat-resistant luminescent materials one by one. Only platinum wire has good performance, but platinum is extremely expensive, and more suitable materials must be found to replace it. In 1879, after several experiments, Edison finally decided to use carbon filament as the filament. He sprinkled a piece of cotton silk with charcoal powder, bent it into a horseshoe shape, put it in a crucible, heated it, made it into a filament, put it in a light bulb, and then used an air extractor to remove the air from the light bulb. The light turned on and could be used continuously. 45 hours. In this way, the world's first carbon filament incandescent lamps came out. On New Year's Eve 1879, Lopack Street, where the Edison Electric Light Company was located, was brightly lit.

In order to develop electric lights, Edison often worked more than ten hours a day in the laboratory, sometimes testing for several days in a row. After he invented carbon filament as a filament, he successively tested more than 6,000 plant fibers, and finally Bamboo filaments are selected, burned in a high-temperature sealed furnace, and then processed to obtain carbonized bamboo filaments, which are then installed into the light bulb. This again increases the vacuum of the light bulb, and the light can be continuously lit for 1,200 hours.

More than 1,600 materials with different heat resistances

More than 6,000 plant fibers

The number of tests is even more difficult to count

This A series of data are enough to illustrate his persistence

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"Victory often lies in the effort of persisting a little longer"

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