Tag: lost technology
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The Viking Sunstone: How It Works, and What Has Been Found
The physics is settled: a calcite crystal really can locate the sun through cloud. Everything else is argued — the one text describing it…
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Roman Concrete: The Material That Heals Itself
Modern marine concrete fails in 50 years. Caesarea harbour has been in the Mediterranean since 22 BC and is getting stronger. What the lime…
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The Baghdad Battery: The Chemistry Works. That Was Never the Question.
Copper, iron, bitumen and vinegar will produce a current whether anyone intended it or not. What the Baghdad jars actually are, and why capability…
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The Antikythera Mechanism: A Computer From 100 BC
Thirty surviving bronze gears that predicted eclipses, tracked four calendar cycles and modelled the moon’s variable speed. Nothing comparable appears again for 1,400 years.