mes into contact with a hot flame, be- principle, and is characterized thereby that the pieces the fact that in France alone there are over twelve comes covered with a film of oxide which, despite the to be welded are blunt in form and are so brovght into hundred factories in which the various… … this theory, the various aluminium factories and in such cases will almost always provide have attempted, at all times, to supply the a sufficiently hot flame, which, in its char- metal in as pure a condition as possible. * See Electro-Chemical and Metallurgical Industry, July, According to…
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