O.K. I'm coming in late (and not sure how long I'll be able to
read responses, with Sandy headed just a little North of us based on the
latest predictions -- and they're talking about long power outages.
And posting from rec.crafts.metalworking as always.
However, I now have a guess for # 2696
Given the wire grid in the bottom, and the vent pipes on the
sides, I find myself thinking of it as being for lost-wax casting. A
master of the workpiece is made in wax. It is sometimes then coated
with a refractory material which hardens and holds the surface texture,
then perhaps packed in prepared sand for support -- or perhaps the wax
is just packed in prepared sand if surface finish is not important, then
it is baked to melt out the wax and harden the coating if present, and
once that is done, the molten metal is poured in. Once it hardens, it
is removed from the box and the sand (and possible coating) are broken
off.
The baking out of the wax is a possible explanation for the
black stains on the top.
It does not look like the usual two-part flask for straight sand
casting, but it may work for lost-wax casting.
Oh yes -- also some approaches make the master of styrofoam
instead of wax, and burn that out.
The pipes to the side both carry out the smoke, and possibly
also can serve for lifting it while it is hot.
Enjoy,
DoN.
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