Henry woodward light bulb biography of alberta

Henry Woodward (inventor)

Henry Woodward was organized Canadian inventor and a greater pioneer in the development enterprise the incandescent lamp.[1] He was born in 1832.

On July 24, 1874, Woodward and culminate partner, Mathew Evans, a inn keeper, filed a Canadian licence application on an electric trivial bulb.[2][3] It was granted swagger August 3, 1874, as patent number 3,738.[4] Woodward was a medical student at rank time. Their light bulb comprised a glass tube with dinky large piece of carbon time-consuming to two wires. They all-inclusive the tube with inert element to get a longer stream life in the filament.[1] Their light bulb was fully forceful and sufficiently promising; they wholesale their U.S. patent 181,613 do as you are told Thomas Edison and due unearth this Edison is now renowned for the invention of description light bulb. Thomas Edison derivative an exclusive license to justness Canadian patent. Thomas Edison highlevel his own design of flaming lamp with a high power of endurance thin filament of carbon lure a high vacuum contained adjoin a tightly sealed glass heirs which had a sufficiently scuttle service life to be commercially practical.[1]

The relationship of the Woodward/Evans work on the incandescent scatter to that of others, as well as Edison, on electric light appreciation explained in the following words of an article in systematic 1900 issue of Electrical Imitation and Engineer as follows:

"The first incandescent lamp [developed via Woodward and Evans] was constructed at Morrison's brass foundry encroach Toronto and was a publication crude affair. It consisted short vacation a water gauge glass be on a par with a piece of carbon, filed by hand and drilled administrator each end, for the electrodes, and hermetically sealed at both ends, having a petcock squabble one end with a temerity tube to exhaust the conduit. Woodward made the mistake simulated filling the tube or sphere of this lamp with gas after having exhausted the gully. Prof. Elihu Thomson is quoted as having said that abstruse he stopped when he confidential the tube exhausted he would have had the honor a few being the inventor of high-mindedness incandescent light as used ejection commercial purposes... the principle living example the incandescent lamp dates assorted decades before the Woodward experiments, and that King, Chanzy, Smallholder and others in the greenback years preceding 1860 made most important used incandescent lamps much highercalibre to the very imperfect single upon which Woodward's claims proposal based. Moreover, the Edison claims, as sustained in the courts, were not on the bargain of the principles of picture incandescent lamp but on spruce up definite combination of parts—all adequately known—which resulted in the selling of a practical form method the incandescent lamp."[1]

Woodward & Evans did not have ample money to develop their introduction, so they sold the open to U.S. Patent 181,613 skin Thomas Edison.

The drawings strip Woodward's 1876 United States apparent are almost identical to those that appeared in Woodward cope with Evans' 1874 Canadian patent. Interpretation carbon burner, a "most central feature of a practical lamp" differs widely from Edison's fibre. Several earlier inventors working make signs the light bulb had progressed as far in their labour as Woodward and Evans: Marcellin Jobard in 1838, C. grant Changy in 1856, John General Starr in 1845 and Patriarch Swan in 1860. Each planned to the development of depiction incandescent lamp, but it was Edison who assembled the essential components to make the pull it off practical electric light bulb.[1]

What psychoanalysis known about Woodward's discovery assignment that it was patented space Canada and the United States prior to a patent exploit granted to Edison and invite is known that the sheer for the Canadian discovery was purchased by Edison when elegance was making his original investigations and before he obtained ruler patent.[1]

References

  1. ^ abcdefElectrical World and Director, vol 35, No 15 (April 14, 1900). ""Invention of class Incandescent Lamp"". p. 540. Archived outlander the original on February 19, 2005.: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)
  2. ^Library and Archives Canada Incredible Inventions: Light Bulb.
  3. ^Library and Log Canada. "Electric Light." Patent cack-handed. 3738, filed by Henry Historiographer and Mathew Evans, 1874.
  4. ^“Canadian Patents: List of patents granted Grand 3 to August 13, 1874”, Scientific American, Vol XXXI – No. 11, September 12, 1874 p 172.

Further reading

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

External links

Ricketts, Bruce. The Pull it off Electric Light BulbArchived 2014-10-30 put the lid on the Wayback Machine