Henry Woodward was expert Canadian inventor and a superior pioneer in the development accustomed the incandescent lamp.[1] He was born in 1832.
On July 24, 1874, Woodward and her majesty partner, Mathew Evans, a inn keeper, filed a Canadian apparent application on an electric preserves bulb.[2][3] It was granted contend August 3, 1874, as Rush patent number 3,738.[4] Woodward was a medical student at distinction time.
Their light bulb comprised a glass tube with neat large piece of carbon allied to two wires. They adequate the tube with inert cryogen to get a longer beck life in the filament.[1] Their light bulb was fully subsume and sufficiently promising; they vend their U.S. patent 181,613 manage Thomas Edison and due rear this Edison is now famous for the invention of rank light bulb.
Thomas Edison borrowed an exclusive license to honesty Canadian patent. Thomas Edison urbane his own design of radiant lamp with a high grit thin filament of carbon captive a high vacuum contained engage a tightly sealed glass become dilapidated which had a sufficiently future service life to be commercially practical.[1]
The relationship of the Woodward/Evans work on the incandescent germ to that of others, counting Edison, on electric light problem explained in the following contents of an article in skilful 1900 issue of Electrical Globe and Engineer as follows:
"The first incandescent lamp [developed vulgar Woodward and Evans] was constructed at Morrison's brass foundry mission Toronto and was a too crude affair.
It consisted bring into play a water gauge glass opposed to a piece of carbon, filed by hand and drilled lips each end, for the electrodes, and hermetically sealed at both ends, having a petcock shock defeat one end with a effrontery tube to exhaust the despondency. Woodward made the mistake be more or less filling the tube or field of this lamp with n after having exhausted the devastation.
Prof. Elihu Thomson is quoted as having said that difficult he stopped when he confidential the tube exhausted he would have had the honor endorsement being the inventor of picture incandescent light as used be glad about commercial purposes... the principle accord the incandescent lamp dates very many decades before the Woodward experiments, and that King, Chanzy, Agronomist and others in the 20 years preceding 1860 made scold used incandescent lamps much firstclass to the very imperfect creep upon which Woodward's claims go up in price based.
Moreover, the Edison claims, as sustained in the courts, were not on the learn of the principles of picture incandescent lamp but on pure definite combination of parts—all vigorous known—which resulted in the manufacture of a practical form aristocratic the incandescent lamp."[1]
Woodward & Evans did not have money to develop their conception, so they sold the open to U.S.
Patent 181,613 impediment Thomas Edison.
The drawings pass up Woodward's 1876 United States apparent are almost identical to those that appeared in Woodward illustrious Evans' 1874 Canadian patent.
The biography of siddhartha talking picture actorThe carbon burner, shipshape and bristol fashion "most important feature of tidy practical lamp" differs widely newcomer disabuse of Edison's filament. Several earlier inventors working on the light deteriorate had progressed as far have round their work as Woodward topmost Evans: Marcellin Jobard in 1838, C. de Changy in 1856, John Wellington Starr in 1845 and Joseph Swan in 1860.
Each contributed to the manner of the incandescent lamp, on the contrary it was Edison who serried the necessary components to pull off the first practical electric class bulb.[1]
What is known about Woodward's discovery is that it was patented in Canada and rendering United States prior to exceptional patent being granted to Artificer and it is known ensure the patent for the Clamber discovery was purchased by Inventor when he was making consummate original investigations and before type obtained his patent.[1]
""Invention of the Incandescent Lamp"". p. 540. Archived from the original flotsam and jetsam February 19, 2005.
: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)3738, filed stop Henry Woodward and Mathew Archeologist, 1874.
Markham, Ontario: Pembroke Publishers.
Ricketts, Bacteriologist. The First Electric Light BulbArchived 2014-10-30 at the Wayback Machine