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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.

Blowing a Glass Cylinder.
Fig. 56.--Blowing a Glass Cylinder.

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