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  I wrote:-
  Relevant to cylinders and backpacks although not to diving.
  Does anyone out there in any country know of availability of a pair of
oxy-gas cylinders for running a blowtorch off, which can be worn on the back
like scuba cylinders while the blowtorch is being used? Many years ago in a
display of fireman's equipment in Manchester I saw an oxyhydrogen blowtorch
run off backpack gas cylinders; but I have seen nothing more of such things.

  Rodney Nairne <rnairne@sy*.DI*.oz*.au*> replied:-
> Don't play with these things underwater. The molten metal stays in bubbles,
> which sink onto you, burning nice holes in skin or suit. The O2 and Hydrogen
> bubbles often explode, and you need a helmet to use it. If a larger pocket
> of gas forms, (bigger than small bubbles) the resulting explosion will be
> big enough to maim or kill. (It often does). Rod Nairne.

  (1) I meant: a blowtorch with backpack cylinders to use on land.
  (2) How do people using blowtorches underwater avoid these hazards?

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