When was Edison's first success in his light bulb?

Answer 1

The first electric light was made in 1809 by Humphry Davy, an English scientist. He experimented with electricity and when he connected wires and a piece of carbon to a battery, the carbon glowed, producing light.

In 1875 Herman Sprengel invented the Mercury vacuum pump making it possible to develop a practical electric light bulb by making a really good vacuum inside the bulb possible.

In 1878 Sir Joseph Wilson Swan, an English physicist, was the first person to invent a practical and longer-lasting electric light bulb (13.5 hours). Swan used a carbon fiber filament derived from cotton.

Many others contributed to the development of the light bulb during the years. It Is clear that Tomas Alva Edison could not be credited with the invention of the electric light bulb.