Source
Patent for Woodward & Evans' Electric Light, July 24, 1874

Did you think Thomas Edison invented the light bulb? Many scientists from various countries had been working for many years to develop a long-lasting light bulb. Toronto medical student Henry Woodward was one Canadian who was working on the problem, with help from Matthew Evans, a Toronto innkeeper. Around 1873 or 1874, they invented a glass bulb that housed a carbon filament and nitrogen gas. They patented it in 1874.

Unfortunately, they didn't have enough money to produce and sell the light bulbs, so a year later they sold the patent to… you guessed it: American inventor Thomas Edison!

Source
Thomas Edison

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Electric lamp post, Metcalfe Street looking north, Ottawa, 1916

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Gas lamp post, Dalhousie Street, Ottawa, April 1882

References

Black, Harry. Canadian Scientists and Inventors. Markham, Ontario: Pembroke Publishers, 1997.

Hughes, Susan. Canada Invents, Toronto: Owl Books, 2002.