Up: Glassmaking
How It Is Made
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articles are extremely brittle after the shaping stage, which has
cooled the glass very quickly. It is therefore necessary to reheat
them to a dull red, and allow them to cool gradually, before they are
fit for use.
Fig. 54.--Blowing the Ball for a Glass Cylinder..
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A bottle leer is simply a long firebrick tunnel heated from
the end at which the bottles are introduced in large iron trays. When a
tray is put in, it pushes its predecessors a little way
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