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whisperlite, taken 2017-10-28 || Canon Canon EOS 6D | 24mm | 1/1000s @ f/2.8

In mountaineering, we use stoves which consume liquid fuel, not vapor gas; extreme cold makes the latter fail to maintain pressure. With the liquid fuel, there's a pump we can use to pressurize everything by hand. Neat.
But lighting one of these stoves takes a bit of practice—you need to prime it by lighting a bit of fuel on fire to heat up the tubing and burner element. Once the priming flame is just about died out, you open the fuel valve (again) and if everything's gone well, the fuel will vaporize on its way to the element and burn nicely.