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Flux for Spelter Solder

The flux employed for spelter solder is borax, which can either be used separately, or mixed, by rubbing to a cream, or mixed with the solder in a very little water. 3490. Το Hard Solder. When the work is cleaned, bound, fluxed, and speltered, the whole is subjected to a clear charcoal or coke fire; or, what is now becoming far more general, convenient, cleanly, and manageable, a bellows blowpipe. The air passes from a bellows propelled by the foot through A (See Engraving.) The gas passes through B,