Society of Glass Technology · [Sheffield] · leaf 163
ter and also assists in removing the water from the slip. Itwill be obvious that so long as the clay is in contact with the plasterand the vacuum maintained, the thickness of deposit will continue toincrease. * Tho first casting from a new mould is generally a bad one.t If a rim mould is used a, a… … remedied by finishing the inside with knife and leather when thesurface is fairly hard. Care must be exercised when doing this topress in the grog and not drag it into the holes. The first stage
Glass
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