The recent big thing in Lost High Ancient Technology has been about 1.5 micron surface roughness at the Barabar Caves in India. Apparently 31 microns at Puma Punku is evidence of precision also, that shouldn't even be worth mentioning as surface roughness is caused by the scratches of the abrasive. 31 microns or even 10 microns is so far from amazing precision that the people promoting this no next to nothing of how things work. Or are they looking for a new hook because all their other claims of " impossible" achievements have been shattered by cheap and easy experimentation.
I will deal with the Barabar Caves directly soon enough as I have located a company with the instruments to measure a sample piece. Though I must say I shouldn't had to have done it since even a cursory look at achieving flatness and polish is has been known for a long time. For instance the Whitworth 3 plate technique for hand grinding precision surface plates is based on old polishing techniques.
Hand polishing to a small area to a micron is no big deal. If it was measured in few nanometres as with optical equipment and the best surface plates it might be interesting. But a couple of microns is the same as gem and rock polishers do to this day. How many mirror finishes pieces of stone can be found in historic buildings? A hell of a lot. It's curious how lost high technologists never show these things. Sydney Australia must be evidence of lost ancient high technology by that logic.
Youtube has many videos of people creating precision surface plates and creating a mirror polish on stone with simple techniques. These people must be from a lost advanced civilisation?
https://youtu.be/v0gDarx6p0A
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