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 171
redness. Advantage isthen taken of the softened state of the cylinder to open it, bythe help of an appropriate iron instrument, lifting up and turn-ing back the cut edges of the glass, until the whole is flattenedupon the hearth of the annealing oven. A small iron rake isthen employed to push the… … and cemented. All further processes are in every respect thesame as are followed with plates that have been cast. The great size and weight of the glass render these opera-tions exceedingly laborious, so that a man and his assistant canhardly do more than make one plate in an hour, nor can…
Porcelain · Glass manufacture
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