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 140
w Fig. 6. rod, by touching it near to their point of contact with a smallpiece of iron wetted with cold water. This occasions the glass CHAP. IV. FLINT GLASS. 139 to crack, so that by giving a smart stroke to the hollow rod, itis immediately and safely separated, leaving a small hole at thepoint of… … with arms sloping forward, whereon the pontil is supported be-fore him in a horizontal position, the glass being at the mansright hand. Thus placed he governs with his left hand themovements of the pontil by twirling it to and fro along the armsof the stool; and taking in his right hand an iron…
Porcelain · Glass manufacture
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
