Word of warning. We bought a copy of the Wheems & Plath miners lamp a year or so back and ended up throwing it away. Adjusting the thing was a major nightmare unless it was dead cold and refilling the thing was very messy indeed.
I am not saying that these are the same as the one we bought but be a little bit careful.
“Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life.” Terry Pratchett