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UFO / UAP

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The granite core published by Petrie was made by the ancient Egyptians using a tubular drill. Note the similarity of the concentric lines (arrow) found on the core.

Which core are they referring to then ?
It isn't named, that the one you're thinking of is No.7 might give you a hint that there more than one.

And they DO match the machining marks on the core they had in that article.
 
He’s joking ffs.

You lot just can’t admit defeat.

No one seriously things copper can chisel granite.

You lot?

Fwiw, personally, I'd be thrilled if 20ft tall aliens HAD actually built the things, AND it could be proven.

But it can't.

All we have at the current time is rudimentary tools, ingenuity, and pan-generational persistence.
 
That might be the case, penn though had a drill speed of 1000rpm.

Do you think that’s possible by hand ?
Penn did it using a power tool, after all they did loads of different holes to test different combinations of tools and abrasives, but doing it slower using a bow drill is equally possible.
 
Penn did it using a power tool, after all they did loads of different holes to rest different combinations of tools and abrasives, but doing it slower using a bow drill is equally possible.
Apples and oranges.

Glad you agree….
 
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