Edison Light Bulb

"TO INVENT YOU NEED A GOOD IMAGINATION AND A PILE OF JUNK"

-Thomas Alva Edison

Born on February 11, 1847, in Milan, Ohio, Thomas Edison rose from humble beginnings to work as an inventor of major technology. Setting up a lab in Menlo Park, some of the products he developed included the telegraph, phonograph, the first commercially practical incandescent electric light bulb, alkaline storage batteries and Cinematograph (a camera for motion pictures). He died on October 18, 1931, in West Orange, New Jersey.

Inventor Thomas Alva Edison was born on February 11, 1847, in Milan, Ohio. He was the last of the seven children of Samuel and Nancy Edison. Thomas's father was an exiled political activist from Canada. His mother, an accomplished school teacher, was a major influence in Thomas’ early life. An early bout with scarlet fever as well as ear infections left him with hearing difficulties in both ears, a malady that would eventually leave him nearly deaf as an adult. Edison would later recount as an adult, with variations on the story, that he lost his hearing due to a train incident where his ears were injured. But others have tended to discount this as the sole cause of his hearing loss.

In 1854, the family moved to Port Huron, Michigan, where Edison attended public school for a total of 12 weeks. A hyperactive child, prone to distraction, he was deemed "difficult" by his teacher. His mother quickly pulled him from school and taught him at home. At age 11, he showed a voracious appetite for knowledge, reading books on a wide range of subjects. In this wide-open curriculum Edison developed a process for self-education and learning independently that would serve him throughout his life.

Three factors in combination are generally recognized as contributing to Edison’s success:

• 1. A durable incandescent material

  2. Elimination of air from the bulb-a better vacuum

1. A filament material of high resistance

Thomas Edison’s serious incandescent light bulb research began in 1878, filing his first patent later that year…”Improvement In Electric Lights” in October 1878. His experiments involved the fabrication and testing of many different metal filaments, including platinum. Platinum was very difficult to work with, and prone to being weakened by heating and oxygen attack.

In addition, platinum was expensive, and too low in resistance; which would require heavy copper conductors in Edison’s electric distribution system he was designing to supply commercial installations of his bulbs. This system would later become the model for our modern electric utility power distribution system of today.

Edison then resorted to a carbon-based, high-resistance, filament. One year later in October 1879 Edison successfully tested a filament that burned for 13.5 hours. Continuing to improve his design, by November 1879, he filed for a U.S. patent for an electric lamp using “a carbon filament or strip coiled and connected … to platina contact wires”. The filament was made from a piece of carbonized thread.

By New Year’s he was demonstrating lamps using carbonized cardboard filaments to large crowds at the Menlo Park laboratory. It was not until several months after the patent was granted that Edison and his team discovered that a carbonized bamboo filament could last over 1200 hours. A year later, Edison began manufacturing commercial lamps using carbonized Japanese bamboo as filaments.

Throughout his career, Edison worked on many improvements to his signature invention, an invention that literally changed the way we live after dark. Prior to the light bulb, folks burned lamp oils or used manufactured natural gas for illumination, a rather dangerous way to provide illumination. Electric lights became cheap, safe, and convenient to use and the public and commercial concerns installed them in rapidly increasing numbers. The rest is history.