I have to correct myself about the hydrogen/oxygen potential. I guess it is higher than oxy/acetylene not lower so out goes that theory about the need for the fire bricks to retain heat.
looks like its a hydrogen/oxygen mix. This has relatively low heating potential compared to oxy/acetylene which must necessitate the fire brick hearth to retain heat.
One more interesting thing, at least to me is that often, when brazing silver or gold a brick of charcoal can be used to position the piece. This charcoal produces a reducing atmosphere during brazing, reducing the need for flux and or giving a better result. Might the charcoal fire hearth technique accomplished a similar thing?
Dave Bohm Bohemian
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