The Thing That Brightened up America
How it works
Edison's light bulb used a carbonized piece of bamboo as a filament, whereas most of his peer's models used a piece of metal wire, and innovation which gave his bulbs a life expectancy of over one thousand hours. However, a filament and electrical current alone are not sufficient to make a light bulb. If enough oxygen is present inside the glass, the heat produced in the filament would quickly cause it to catch fire. In order to prevent this, it is necessary to create a vacuum inside the bulb itself.