Blowlamp
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A blowlamp is a simple heating torch, which burns fuel with ambient atmospheric air. It will typically run on propane or butane cartridges, or be fed from a liquid petroleum gas cylinder via a hose. 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. They cannot be used for welding, but find many other uses, not least because in their simplest form of a disposable canister feeding a hand-held torch they are very cheap and highly portable, and because the LPG fuel is very cheap in comparison to acetylene and oxygen.
Older blowlamps used liquid fuel such as kerosene in the form of paraffin oil, or gasoline and more recently biodiesel. These are largely redundant, and may be difficult to start, requiring pre-heating with methylated spirit. If any doubts exist as to the integrity of the pressurized fuel tank or any of the seals in the torch, it should be treated strictly as an antique - if the tank bursts there is a very real risk of explosion or fire.
