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 147
lows to project beyond the extreme end of the tube; andfirst rolling it on the iron plane before described, to give theglass a cylindrical form, he commences blowing, when it as-sumes the shape of a pear. A fresh heating and a second blow-ing enlarge its dimensions, and render its shape more… … surface; a small portion of melted glass is collected on the endof a punt, and is applied to the centre of this flattened side,forming an union with it exactly opposite to the hollow tube, CHAP. V. CROWN GLASS. 147 which is then removed by wetting the glass near to their pointof union, leaving a…
Porcelain · Glass manufacture
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