The Casting of Pots for Use in Experimental Work on Optical Glass
T140-T153 (20 pages including 6 of plates)
Casting has been found by certain manufacturers to be a good method for making glass pots, but it requires to be carried out with a specially prepared clay body. This is due to the fact that the ordinary glass pot as required for use by the glass-maker has a thickness of wall amounting to 3-4 in. With a non-uniform material, such as a mixture of clay and finely ground fired ware (grog) the segregation of one of the constituents into bands or layers is very likely to occur in a pot of this thickness. Consequently, the casting process for glass pots is not so universally employed as that of hand-moulding.
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