Up: Glassmaking
How It Is Made
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The cylinder has then to be separated from the blowpipe end,
by passing a thread of hot glass round the circumference and withdrawing
it suddenly, and applying a cold iron to the line touched by the thread.
The sudden cooling cracks the cylinder off.
Fig. 56.--Blowing a Glass Cylinder.
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A rim is cut off the rough end with a diamond, and the
cylinder is split longitudinally by a cutter drawn along the inside, and
laid in a heating oven, split uppermost, until the glass softens and
flattens out by its own weight into a sheet. From the oven the sheet goes
to the annealing
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