When my father ran a country garage way back in the 1950’s the only comfort heating provided was an enormous vertical axis blowlamp .
Bought Government surplus after the war it consisted of a large drum at the bottom and a tall round pipe pierced with many holes going up from the middle . There was also a branch pipe going from drum to about one third up the tall tube . The drum was about three ft diameter and the whole thing about six feet tall .
In use large quantities of any burnable liquid were poured into the drum and a lighted rag thrown in .
After a very short time a column of roaring flame could be seen inside the tall tube and a good bit more flame out of the top .
Fearsome to watch but it did produce enormous amounts of heat . Never took it apart to see how it worked but must have been a very simple principle .
Nobody knew for certain but the thing was generally believed to be an ex RAF airfield fog dispersal burner .
If anyone knows for certain what it was I would be delighted to hear .