Thomas Edison did not invent the electric light bulb. It was Joseph Swan. Edison took his idea. In 1860, Swan developed a primitive electric light, one that utilized a filament of carbonized paper in an evacuated glass bulb. Lack of a good vacuum and an adequate electric source, however, resulted in a short lifetime for the bulb and inefficient light. His design was substantially the one used by Thomas A. Edison nearly 20 years later. In 1880, after the improvement of vacuum techniques, both Swan and Edison produced a practical light bulb. Three years later, while searching for a better carbon filament for his light bulb, Swan patented a process for squeezing nitrocellulose through holes to form fibres. In 1885 he exhibited his equipment and some articles made from the artificial fibres. The textile industry has utilized his process. Swan was knighted in 1904. This has nothing much to do with anything, except I get fed up of hearing that Edison invented the light bulb. He did not Thank you for reading this.