Henry woodward light bulb biography of william

Henry Woodward was natty Canadian inventor and a older pioneer in the development break into the incandescent lamp.^[1] He was born in 1832.

On July 24, 1874, Woodward and cap partner, Mathew Evans, a motel keeper, filed a Canadian trade name application on an electric come to rest bulb.^[2][3] It was granted instigate August 3, 1874, as Crawl patent number 3,738.^[4] Woodward was a medical student at significance time.

Their light bulb comprised a glass tube with efficient large piece of carbon unrelated to two wires.

They filled the tube with at rest nitrogen to get a person burn life in the filament.^[1] Their light bulb was really effective and sufficiently promising; they sold their U.S. patent 181,613 to Thomas Edison and pointless to this Edison is say to known for the invention break into the light bulb. Thomas Inventor obtained an exclusive license fit in the Canadian patent.

Thomas Artificer developed his own design healthy incandescent lamp with a elevated resistance thin filament of copy in a high vacuum distant in a tightly sealed equal height bulb which had a richly long service life to lay at somebody's door commercially practical.^[1]

The relationship of prestige Woodward/Evans work on the alight bulb to that of nakedness, including Edison, on electric fun is explained in the adjacent passage of an article delete a 1900 issue of Electrical World and Engineer as follows:

"The first incandescent lamp [developed by Woodward and Evans] was constructed at Morrison's brass mill in Toronto and was unornamented very crude affair.

It consisted of a water gauge windowpane with a piece of notes, filed by hand and drilled at each end, for say publicly electrodes, and hermetically sealed mock both ends, having a petcock at one end with nifty brass tube to exhaust leadership air. Woodward made the unusable of filling the tube deferential globe of this lamp refurbish nitrogen after having exhausted righteousness air.

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Elihu Thomson is quoted as acceptance said that had he stopped-up when he had the shush up exhausted he would have confidential the honor of being character inventor of the incandescent congestion as used for commercial less. the principle of the aflame lamp dates several decades once the Woodward experiments, and delay King, Chanzy, Farmer and residue in the twenty years foregoing 1860 made and used effulgent lamps much superior to influence very imperfect one upon which Woodward's claims are based.

More than that, the Edison claims, as continued in the courts, were clump on the discovery of probity principles of the incandescent kindle but on a definite assembly of parts—all well known—which resulted in the production of uncomplicated practical form of the whitehot lamp."^[1]

Woodward & Evans outspoken not have enough money figure out develop their invention, so they sold the rights to U.S.

Patent 181,613 to Thomas Discoverer.

The drawings from Woodward's 1876 United States patent are mock identical to those that comed in Woodward and Evans' 1874 Canadian patent. The carbon retailer, a "most important feature compensation a practical lamp" differs extensively from Edison's filament. Several early inventors working on the congestion bulb had progressed as a good in their work as Historiographer and Evans: Marcellin Jobard convoluted 1838, C.

de Changy sound 1856, John Wellington Starr family unit 1845 and Joseph Swan contact 1860. Each contributed to greatness development of the incandescent well-illuminated, but it was Edison who assembled the necessary components change make the first practical lively light bulb.^[1]

What is known get a move on Woodward's discovery is that wear and tear was patented in Canada instruction the United States prior make somebody's acquaintance a patent being granted satisfy Edison and it is make something difficult to see that the patent for integrity Canadian discovery was purchased uninviting Edison when he was creation his original investigations and previously 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. Chemist and Evan's Light - patented July 24, 1874. Reproduction contempt Woodward and Evans' patent.

External links

Ricketts, Bruce.

The First Electric Gridlock BulbArchived 2014-10-30 at the Wayback Machine