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oil pan 4 05-18-2021 08:58 PM

Ancient precision
Evidence of ancient high precision
Get interesting at 23 minutes in.
No one seems to be able to demonstrate how one can make a corundum vase to high precision and drill handle holes through it or make a dish out of granite so thin it's kind of transparent with copper chisels, wooden hammers and stone pounding blocks.

freebeard 05-18-2021 10:38 PM

As soon as I saw the thread title I thought Seraphium and the Schist disk.

I'm only 38 minutes in but I am being driven from the house by the need for groceries. My theory for the control they had over surfaces is Electrical Discharge Machining.

The Unusual Earth Orbit Circling Above Our Ancient Past
Precise orbit from antiquity? At 13:30 he mentions the precision machining.

oil pan 4 05-28-2021 09:37 AM

How to rebuild society after the solar micro nova?"][/URL]

Back in the old days any blacksmith could make a sword or armor, the bad ass blacksmiths made the files.

freebeard 05-28-2021 01:09 PM

Clickspring is awesome. It makes you appreciate being able to pick up inexpensive tools at Harbor Freight.

His pneumatic fire starter is interesting.

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