Marson, Percival · London, New York [etc.] Sir I. Pitman & Sons · leaf 32
ith water, to any portion of the hot glass,which causes it to fracture at the point of contact withthe cold metal, and a slight jar is then sufficient to breakthe two portions apart. This method of chilling heatedglassware to divide it is applied in the mechanical process 15 16 GLASS of cutting up… … By permission of Melin & Co. HORIZONTAL CRACKING-OFF MACHINE sharp, hot pencil of flame projected from a burner againstthe rotating cylindrical tube of glass at equidistantshort sections, and the divisions chilled by contactwith a cold, steel point, or the heated area may begently scratched…
Glass manufacture
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