Historical Artifacts

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Just a community for everyone to share artifacts, reconstructions, or replicas for the historically-inclined to admire!

Generally, an artifact should be 100+ years old, but this is a flexible requirement if you find something rare and suitably linked to an era of history, not a strict rule. Anything over 100 is fair game regardless of rarity.

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Illustrations of the past should go to [email protected]

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PugJesus

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A collection of glass bottles found in Pompeii, each with double the volume capacity of the previous bottle, Roman Empire, 1st century AD (lemmy.world)

submitted 2 weeks ago by PugJesus to c/historyartifacts

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[–] PM_Your_Nudes_Please 12 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

Probably the same way glass is made today. Get a clay or graphite (both can withstand high temperatures, and can be shaped easily) two-part mold in the size bottle you want. Using a known quantity of glass, (you can just weigh it) you clamp the mold around it and blow it. The air forms a bubble in the glass, which becomes the inside of the bottle. And the walls of the bottle quickly cool and harden (holding the shape of the bottle) when they hit the inside of the mold and it begins sapping the heat away like a heatsink. And since it was a known quantity of glass, you know how much volume inside of the mold is taken up by glass (and inversely, you know how much is taken up by air, which determines the bottle’s volume.)

It’s basically injection molding, but using air to fill the space instead of just injecting glass into the entire mold.

[–] Tylerdurdon 6 points 2 weeks ago

Interesting. It's an art I didn't get into. Thanks for the basic breakdown.