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 88
ance of the clay; and thus the execution of the task issomewhat facilitated. The bore must be made as exactly aspossible in the axis of the stem; and, in forming it, the needlemust be pushed forward by means of its wooden handle, witha gentle and equable pressure. The part which is to form thehead… … whole interior surface of both sections must be slightly touchedwith a brush containing some very limpid oil, that the stemmay be afterwards delivered from it without difficulty. Theroll of clay being placed in one section, the other is fitted to itaccording to marks previously made, so as to…
Porcelain · Glass manufacture
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