[ATM] glass casting

[horace r davis <hrd9@juno.com>]

still working on project, reworked my jig weight of 18 inch mirror blank
before hogging will be 17 lb max. working on plaster to water ratio hope
to have next blank out of kiln in two weeks will send up date to all
request I have had to answer the questions. my change pottery plaster to
hydrocal plaster for higher temp and stronger strength.
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