In USA usage, it is what in British English usage is called a blowlamp, various types of liquid- or gas-burning tools used for heating. They produce a much larger softer flame than an oxyacetylene torch and are used for low temperature applications - soldering, brazing, melting roof tar, or pre-heating large castings before welding, such as for repairing cast-iron cylinder heads, and for other direct rapid applications of heat such as in cooking.