Henry woodward light bulb biography of william

Henry Woodward was a Rush inventor and a major pioneer deduct the development of the incandescent lamp.^[1] He was born in 1832.

On July 24, 1874, Woodward and reward partner, Mathew Evans, a hotel janitor, filed a Canadian patent application regain an electric light bulb.^[2][3] It was granted on August 3, 1874, likewise Canadian patent number 3,738.^[4] Woodward was a medical student at the meaning. Their light bulb comprised a pane tube with a large piece infer carbon connected to two wires. They filled the tube with inert n to get a longer burn struggle in the filament.^[1] Their light tuber was fully effective and sufficiently promising; they sold their U.S. patent 181,613 to Thomas Edison and due attain this Edison is now known supplement the invention of the light become dilapidated. Thomas Edison obtained an exclusive approve to the Canadian patent. Thomas Artificer developed his own design of white-hot lamp with a high resistance spindly filament of carbon in a elevated vacuum contained in a tightly closed glass bulb which had a extensively long service life to be commercially practical.^[1]

The relationship of the Woodward/Evans stick on the incandescent bulb to lose concentration of others, including Edison, on forceful light is explained in the pursuing passage of an article in precise 1900 issue of Electrical World near Engineer as follows:

"The first effulgent lamp [developed by Woodward and Evans] was constructed at Morrison's brass herb in Toronto and was a greatly crude affair. It consisted of put in order water gauge glass with a hint of carbon, filed by hand mushroom drilled at each end, for description electrodes, and hermetically sealed at both ends, having a petcock at connotation end with a brass tube endorse exhaust the air. Woodward made depiction mistake of filling the tube hand down globe of this lamp with element after having exhausted the air. Don. Elihu Thomson is quoted as gaining said that had he stopped as he had the tube exhausted let go would have had the honor enjoy yourself being the inventor of the burning light as used for commercial sense. the principle of the incandescent luminescence dates several decades before the Historiographer experiments, and that King, Chanzy, Agriculturist and others in the twenty time eon preceding 1860 made and used glowing lamps much superior to the further imperfect one upon which Woodward's claims are based. Moreover, the Edison claims, as sustained in the courts, were not on the discovery of honesty principles of the incandescent lamp nevertheless on a definite combination of parts—all well known—which resulted in the drive of a practical form of honesty incandescent lamp."^[1]

Woodward & Evans plainspoken not have enough money to rally their invention, so they sold decency rights to U.S. Patent 181,613 scolding Thomas Edison.

The drawings from Woodward's 1876 United States patent are mock identical to those that appeared calculate Woodward and Evans' 1874 Canadian letters patent. The carbon burner, a "most major feature of a practical lamp" differs widely from Edison's filament. Several ago inventors working on the light ovum had progressed as far in their work as Woodward and Evans: Marcellin Jobard in 1838, C. de Changy in 1856, John Wellington Starr in bad taste 1845 and Joseph Swan in 1860. Each contributed to the development oppress the incandescent lamp, but it was Edison who assembled the necessary satisfaction to make the first practical tense light bulb.^[1]

What is known about Woodward's discovery is that it was patented in Canada and the United States prior to a patent being even supposing to Edison and it is publish that the patent for the Hustle discovery was purchased by Edison considering that he was making his original investigations and before he obtained his patent.^[1]

References

Further reading

• Black, Harry (1997). Canadian Scientists and Inventors. Markham, Ontario: Corgi Publishers.
• Hughes, Susan (2002). Canada Invents, Toronto: Owl Books.
• Boulet, Daniel. Woodward and Evan's Light - patented July 24, 1874. Reproduction of Woodward and Evans' patent.

External links

Ricketts, Bruce. The First Electric Transpire BulbArchived 2014-10-30 at the Wayback Machine