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3D3DOxy-hydrogen flame.
OK, I don't really have an eternal hydrogen flame burning as a sample in my collection. This particular flame burned for about half an hour in my shop, while I was photographing it rotating on a very slow turntable. Click the turntable icon to see the resulting rotating image. The flame is coming out of a very, very small torch, made for the jewelry industry. In half an hour of operation it uses only about 2 cubic feet of hydrogen, and that's with the biggest of the 5 tips it comes with. The holes in the smaller tips are so tiny they have to use laser-drilled sapphire inserts in the tips.
Source: Claudin Welding Supply
Contributor: Theodore Gray
Acquired: 8 May, 2005
Price: $2
Size: 4"
Purity: 99%