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TIL my first boss used to temper glass in a coal fired kiln
He showed me pics from the 80s of this huge, smoky setup in his backyard shed. Now we just order pre tempered units from the factory with a spec sheet. It's wild to think how much of the process we don't see anymore. I guess it's more consistent now, but there was a real art to watching it happen. Makes you appreciate how the trade keeps changing.
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