Around 2000 years ago the Romans started casting slabs of flat glass which were first used in Herculaneum for windows in the houses of the wealthy. The glass wasn’t polished, that came much later, so it had a poor optical quality but it kept out the weather and let in the light. The example below, about 40cm long, is dated between 1 – 70 AD and can be seen in the British Museum.
glass throughout history
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