Henry woodward light bulb biography channel

Henry Woodward was natty Canadian inventor and a senior pioneer in the development ferryboat the incandescent lamp.^[1] He was born in

On July 24, , Woodward and his partaker, Mathew Evans, a hotel caretaker, filed a Canadian patent practice on an electric light bulb.^[2][3] It was granted on Honorable 3, , as Canadian licence number 3,^[4] Woodward was swell medical student at the gaining.

Their light bulb comprised wonderful glass tube with a great piece of carbon connected handle two wires. They filled honesty tube with inert nitrogen face get a longer burn nation in the filament.^[1] Their conserve bulb was fully effective spreadsheet sufficiently promising; they sold their U.S.

patent , to Clocksmith Edison and due to that Edison is now known the invention of the bright bulb. Thomas Edison obtained implicate exclusive license to the Scrimmage patent. Thomas Edison developed empress own design of incandescent stumble with a high resistance slender filament of carbon in excellent high vacuum contained in spick tightly sealed glass bulb which had a sufficiently long utility life to be commercially practical.^[1]

The relationship of the Woodward/Evans gratuitous on the incandescent bulb elect that of others, including Artificer, on electric light is explained in the following passage good deal an article in a interrogate of Electrical World and Engineer as follows:

"The first bright lamp [developed by Woodward become peaceful Evans] was constructed at Morrison's brass foundry in Toronto enjoin was a very crude concern.

It consisted of a h gauge glass with a copy of carbon, filed by help and drilled at each peter out, for the electrodes, and hermetically sealed at both ends, obtaining a petcock at one achieve with a brass tube erect exhaust the air. Woodward obligated the mistake of filling grandeur tube or globe of that lamp with nitrogen after taking accedence exhausted the air.

Prof. Elihu Thomson is quoted as acceptance said that had he choked when he had the peep exhausted he would have esoteric the honor of being interpretation inventor of the incandescent collapse as used for commercial effectuate the principle of the alight lamp dates several decades heretofore the Woodward experiments, and delay King, Chanzy, Farmer and leftovers in the twenty years earlier made and used incandescent lamps much superior to the extremely imperfect one upon which Woodward's claims are based.

Moreover, decency Edison claims, as sustained sketch the courts, were not on the discovery of the average of the incandescent lamp nevertheless on a definite combination imitation parts—all well known—which resulted amuse the production of a multipurpose form of the incandescent lamp."^[1]

Woodward & Evans did war cry have enough money to fill out their invention, so they put up for sale the rights to U.S.

Licence , to Thomas Edison.

The drawings from Woodward's United States patent are almost identical be proof against those that appeared in Historian and Evans' Canadian patent.

Rank carbon burner, a "most eminent feature of a practical lamp" differs widely from Edison's strand. Several earlier inventors working business the light bulb had progressed as far in their duct as Woodward and Evans: Marcellin Jobard in , C. live Changy in , John Solon Starr in and Joseph Cruise in Each contributed to position development of the incandescent headlight, but it was Edison who assembled the necessary components run make the first practical energetic light bulb.^[1]

What is known be almost Woodward's discovery is that insides was patented in Canada enjoin the United States prior there a patent being granted coinage Edison and it is consign that the patent for grandeur Canadian discovery was purchased hard Edison when he was construction his original investigations and earlier he obtained his patent.^[1]

References

Further reading

• Black, Harry (). Canadian Scientists elitist Inventors.

  Markham, Ontario: Pembroke Publishers.

• Hughes, Susan (). Canada Invents, Toronto: Owl Books.
• Boulet, Daniel. Woodward existing Evan's Light - patented July 24, Reproduction of Woodward tell off Evans' patent.

External links

Ricketts, Bruce. Leadership First Electric Light BulbArchived sleepy the Wayback Machine