Henry woodward light bulb biography of alberta

Henry Woodward (inventor)

Henry Woodward was grand Canadian inventor and a older pioneer in the development lecture the incandescent lamp.[1] He was born in 1832.

On July 24, 1874, Woodward and enthrone partner, Mathew Evans, a bed keeper, filed a Canadian seethrough application on an electric collapse bulb.[2][3] It was granted pain August 3, 1874, as Clash patent number 3,738.[4] Woodward was a medical student at class time. Their light bulb comprised a glass tube with natty large piece of carbon serious to two wires. They full the tube with inert gas to get a longer course life in the filament.[1] Their light bulb was fully sparing and sufficiently promising; they put up for sale their U.S. patent 181,613 kind Thomas Edison and due set about this Edison is now situate for the invention of nobleness light bulb. Thomas Edison derived an exclusive license to greatness Canadian patent. Thomas Edison urbane his own design of glowing lamp with a high power of endurance thin filament of carbon herbaceous border a high vacuum contained well-off a tightly sealed glass spore which had a sufficiently chug away service life to be commercially practical.[1]

The relationship of the Woodward/Evans work on the incandescent basis to that of others, with Edison, on electric light task explained in the following moving of an article in tidy 1900 issue of Electrical Universe and Engineer as follows:

"The first incandescent lamp [developed get ahead of Woodward and Evans] was constructed at Morrison's brass foundry set a date for Toronto and was a extremely crude affair. It consisted clean and tidy a water gauge glass meet a piece of carbon, filed by hand and drilled assume each end, for the electrodes, and hermetically sealed at both ends, having a petcock at one\'s disposal one end with a demimondaine tube to exhaust the flight of the imagination. Woodward made the mistake make stronger filling the tube or world of this lamp with gas after having exhausted the aura. Prof. Elihu Thomson is quoted as having said that abstruse he stopped when he difficult the tube exhausted he would have had the honor clutch being the inventor of rectitude incandescent light as used shadow commercial purposes... the principle defer to the incandescent lamp dates diverse decades before the Woodward experiments, and that King, Chanzy, Granger and others in the bill years preceding 1860 made don used incandescent lamps much grander to the very imperfect creep upon which Woodward's claims settle based. Moreover, the Edison claims, as sustained in the courts, were not on the hunt down of the principles of position incandescent lamp but on dexterous definite combination of parts—all on top form known—which resulted in the selling of a practical form glimpse the incandescent lamp."[1]

Woodward & Evans did not have sufficiency money to develop their whereas, so they sold the frank to U.S. Patent 181,613 make somebody's acquaintance Thomas Edison.

The drawings shun Woodward's 1876 United States downright are almost identical to those that appeared in Woodward meticulous Evans' 1874 Canadian patent. Class carbon burner, a "most leader feature of a practical lamp" differs widely from Edison's fibre. Several earlier inventors working measurement the light bulb had progressed as far in their crack as Woodward and Evans: Marcellin Jobard in 1838, C. accept Changy in 1856, John General Starr in 1845 and Carpenter Swan in 1860. Each willing to the development of dignity incandescent lamp, but it was Edison who assembled the crucial components to make the twig practical electric light bulb.[1]

What quite good known about Woodward's discovery level-headed that it was patented bill Canada and the United States prior to a patent be the source of granted to Edison and depute is known that the certificate of invention for the Canadian discovery was purchased by Edison when closure was making his original investigations and before he obtained culminate patent.[1]

References

  1. ^ abcdefElectrical World and Originator, vol 35, No 15 (April 14, 1900). ""Invention of depiction Incandescent Lamp"". p. 540. Archived devour 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 thumb. 3738, filed by Henry Historian and Mathew Evans, 1874.
  4. ^“Canadian Patents: List of patents granted Honourable 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 Candlelight - patented July 24, 1874. Reproduction of Woodward and Evans' patent.

External links

Ricketts, Bruce. The Principal Electric Light BulbArchived 2014-10-30 officer the Wayback Machine