A treatise on the origin, progressive improvement, and present state of the manufacture of porcelain and glass (1832)
[Porter, George Richardson], 1792-1852. [from old catalog] · Philadelphia, Carey & Lea · leaf 131
t is not, indeed, considered prudent to remove themfrom this situation until they shall have been formed for at leasta twelvemonth. For some little time before a pot is put to use, it must beplaced in an apartment wherein heat can be artificially admit-ted, and either raised or lowered at pleasure.… … CHAP. IV. FLIWT GLASS. 131 made nearly as intense as that of the working furnace, for in-sertion in which the crucible is then sufficiently fitted. With all the skill and care that can be employed in theirmanufacture, these crucibles will frequently break during avery early period of their use, and…
Porcelain · Glass manufacture
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