Jan 13, 2020
Issue 3340
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Bill Mehlenbacher
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Cohocton NY 14826
Answer
Hello Jeremy Hayes,
The workers would blow the glass into molds to achieve the shape and calipers to determine the length or height of a particular design/piece.
Corning produced the following video( turn on your sound before viewing ) which explains a bit of the technique:
Regards,
David P. Donaldson, MFA