Quote:
Originally Posted by alexander
2.
Agreed, gray granite is not harder then sand, problem is, you still can't polish it to the level it was polished to using sand, it's too course for he job, we are talking about surfaces that would take 1500 grit diamond polishing pads, i dont believe you can find sand anywhere near the right coarseness, and am not sure if you can make it...?
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I need to polish stone...I use a piece of the same stone against it, and they polish each other
chipping bits off and slowly crushing those bits into a fine powder between the two sliding slabs. By using 2 blocks of the same material the loading actually helps the final polish quite a bit. Keeping the slabs to a significant fraction of each other's size I can even polish to very fine accuracies, all of it taking just time and effort with repetitive motions.
Egyptian teeth are prime exaples of the effects of sand and stone wearing away at things. It's not magic, it's simple logic and material knowledge with a bit of effort and a lot of boredom.
They had no tv
they had no radio
there was a large populace with lots of time to spare in between caring for crops.
I'm not surprised in the slightest what a mass of bored people can do if given direction.
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Sometimes a Hypography Forum Administrator
"With a big enough engine, even a brick will fly." -Law of Aerospace
