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Old 05-18-2021, 08:58 PM   #1 (permalink)
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Ancient 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.

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Old 05-18-2021, 10:38 PM   #2 (permalink)
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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.

edit:

Precise orbit from antiquity? At 13:30 he mentions the precision machining.
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Old 05-28-2021, 09:37 AM   #3 (permalink)
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How to rebuild society after the solar micro nova?

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Old 05-28-2021, 01:09 PM   #4 (permalink)
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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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Old 12-27-2021, 02:39 PM   #5 (permalink)
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40,000 to maybe possibly as old as 70,000 year old drill and stone work. The hole was drilled rapidly with little to no bit deflection, almost as if they used some sort of drilling machine.
https://youtu.be/kKEGouqTQ5Y
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Old 12-27-2021, 02:52 PM   #6 (permalink)
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You can drill precision holes with abrasives or technically just water or even air. Grind and polish too, no hammered chisels necessary
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Old 12-27-2021, 03:49 PM   #7 (permalink)
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No one expected ancient people like that to be this capable.
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Old 12-27-2021, 03:51 PM   #8 (permalink)
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precision

The Metropolitan Museum says the Egyptians had saws and coring drills of bonded particulate abrasives, and performed finishing operations with rubbing stones and abrasive slurries.
A neighbor is an Austin limestone sculptor and uses all these techniques on the softer stone as well.
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Old 12-27-2021, 04:39 PM   #9 (permalink)
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Quote:
How to rebuild society after the solar micro nova?
This is so much more interesting than 'discussing' climate change.

I'd like to do the props and sets for a post-apocalyptic story. The hook would be that life is better after the Apocalypse. A medieval-level technology with high tech masquerading as 'majic'.

The 3D house printer would consist in a mast with three yardarms creating a[n irregular] hexagon 40 ft in the air. It would suspend three cable inverted tripods Each cable would be pulleyed and controlled from the ground by crews coordinating their movements with sea shanties.

A wind-powered Olds elevator would lift cob to the top where it would be fed to one, or up to three, extruder[s]. Each could be replaced by a pick'n'place gripper to lay stone [else hemp Lego block] walls, or a pile driver/tamper for rammed earth floors.

The hard part would be getting the mast out of the finished structure so I propose stacked short sections of log caged by a tensegrity mast to stiffen it.

Up on the hill would be a wizard's tower with a tall lightning rod to run the antiquitech lighting, but it would have a glass cartridge vial as a fuse filled with newt's eylids and other orgainc refuse. Occasionally a lightning strike would reduce the fuse material to flash graphene. Which he would collect and distribute to the townspeople as an amendment to their adobe and cob.

It would be far enough North that sailing ships could reach ice floes, where they carve out needle shapes, capture them between two ship and spin them to carve a hydrodynamic profile and wrap it with wool tarps, to tow home and into a drydock where it supplies fresh water to the community.

For the ships I'm all over the place. Maybe like the low-poly wooden brigatines Cortez constructed for the siege of Tenochtitlán in 1521. The homes and shopping malls would be geodesic domes with Tartarian detailing.


https://external-content.duckduckgo....6pid%3DApi&f=1

The Golden Age as predicted by Scott Adams. It's pretty much high tech at both ends with low tech in the middle [ages].
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Old 12-27-2021, 05:15 PM   #10 (permalink)
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Solar micro nova

I don't think there's such a thing.
1) the Sun is a main sequence star
2) it's 4.6-billion years old
3) it's lifespan is 10-billion years
4) 3.5-billion years ago, Earth was in the middle of the Goldilocks zone
5) Solar luminosity will increase 10% per billion years
6) By 500,002,015 all multicellular life will be threatened
7) By 1.75-billion years from now, the oceans will have evaporated away
8) as hydrogen fuel is spent and helium is burned, the Sun's interior pressure will overcome gravitational forces, and expand into a Red Dwarf incinerating the solar system

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