Charles, et al. Another source of carbon could be carbon piles. Some old battery testers use them and might be available from surplus outlets. Although more of a specialty item, carbon tools are used in glass blowing and vacuum tube (and CRT) manufacturing to shape the softened glass. It is preferred due to its extremely low thermal conductivity, which doesn't crack the glass. Karl _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
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