Incandescent Light Bulb
Who invented the light bulb?
In 1860, Joseph Wilson Swan tried to make a long lasting light. He found that a carbon paper filament worked well.
In 1879, Thomas Edison discovered that if you have an oxygen free bulb with a carbon filament, it glowed for 40 hours before burning out. Later on he found a way to make a bulb glow for over 1,500 hours.
In 1903, Willis Whitney made a treatment for the carbon filament so that it wouldn't darken the bulb as it glowed.
Seven years later in 1910, William David Coolidge made a tungsten filament that lasted longer.
Why should you buy it?
- The light bulb allows you to not be in the dark at night as well as during the day.
- You don't have to burn candles.
- The light bulb increases productivity because you can now work at night or do things during the night as well as the day.