[Jewelry making - Article 00139] - Re: [Orchid] Preparing pitch bowl

[Alberic]

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Marty:

    No, the "plaster in the bottom of the bowl" thing isn't a
    misunderstanding, it's a fairly standard trick. The issue is that to
    do their jobs correctly, pitchbowls need to be hemispherical. Which
    leaves a *huge* volume in the bottom of the bowl that most people
    will never use. Thus the origin of the idea of filling that volume
    with something cheaper than pitch....like plaster. 

    I've known people to use concrete, or redi-mix, which is heavier
    than plaster. Personally, I use large lead bricks, but that's because
    I have them, and I do a lot of things where I want the bowl to be
    pretty massive. (and thus resist moving while I bang on it.) The
    reason pitchbowls are hemispherical is so that you can tilt and spin
    them to whatever angle you need while you're working. The reason you
    want them heavy is so that they *stay* at that angle while you pound
    on them. 

FWIW.
Brian Meek.

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