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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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RhynoCZ |
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RhynoCZ Super Spammer
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stinkwheel |
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stinkwheel Bovine Proctologist
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Posted: 20:16 - 25 Feb 2023 Post subject: |
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Neolithic people (technically bronze-age, but they didn't have any metal tools) in the Northern Isles were building three story high, bell-curved tower houses with two concentric walls called Brochs out of drystone at about the same time as the pyramids. Some of them are still standing. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Islander |
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Islander World Chat Champion
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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Islander |
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Islander World Chat Champion
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Islander |
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Islander World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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stinkwheel |
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stinkwheel Bovine Proctologist
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Islander |
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Islander World Chat Champion
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Islander |
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Islander World Chat Champion
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Bhud |
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Bhud World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
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Posted: 20:22 - 26 Feb 2023 Post subject: |
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They traditionally cut jade with a mud saw made from a piece of string. Neolithic people ground flint axe heads.
Don't underestimate what a hard abrasive and plenty of time can do. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Bhud |
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Bhud World Chat Champion
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Islander |
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Islander World Chat Champion
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Posted: 22:21 - 26 Feb 2023 Post subject: |
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What you have there is a fine grained igneous rock called diorite. The white crystals are called phenocrysts and they're feldspar. Diorite has a rough hardness of 6 on the Mohs scale. Silicon dioxide (quartz) a major constituent of sand has a hardness of 7. There's a readily available abrasive. They would also have had access to garnet which has a Mohs hardness of 8-8.5 2 - 3 times as hard as silicon dioxide.
They also had plenty of time on their hands for fine work. Egyptians were masters of working diorite.
It really isn't a mystery. It's thought to be for mixing grain. Schist is a complex rock. It's a highly foliated (layered) metamorphic rock formed at great depth and pressure during orogenic (mountain building) episodes. It can take a lot of forms but the main thing to take away from this is that it's not that hard a rock and if you have a specimen that's well consolidated, easily worked.
Ancient Egyptians were highly skilled craftsmen without the time pressures of modern society. |
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Bhud |
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Bhud World Chat Champion
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Islander |
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Islander World Chat Champion
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Bhud |
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Bhud World Chat Champion
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Islander |
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Islander World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
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Posted: 00:07 - 27 Feb 2023 Post subject: |
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They had enough time to clear boulders off roads by repeatedly building hot fires around them until they were really hot then dousing them with vinegar until they fractured.
Hell, we made a canal network in the UK using Irish people with spades and wheelbarrows. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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BanditsHigh |
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BanditsHigh Worse than a woman
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stinkwheel |
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stinkwheel Bovine Proctologist
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Islander |
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Islander World Chat Champion
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Old Thread Alert!
The last post was made 1 year, 57 days ago. Instead of replying here, would creating a new thread be more useful? |
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