July 24th, 1874:
On July 24, 1874, a Canadian patent was filed by a Toronto medical electrician named Henry Woodward and his colleague Mathew Evans. They built their lamps with different sizes and shapes of carbon rods held between electrodes in glass cylinders filled with nitrogen. Woodward and Evans attempted to commercialize their lamp, but were unsuccessful. They eventually sold their patent to Edison in 1879.
Featured image courtesy of Mysteries of Canada.
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