Thanks for the links.
Due to the fact that Vyse found a fissure at the opening of the pyramid I'm working my crackpot idea about counterweights again. He also mentions that ancient reports say the stones moved up to the pyramids 300' at a time which implies a mechanical means and is consistent with the use of counterweights.
I've been led in a surprising direction by the geology of this region and due to possible ramifications don't want to report anything until the theory is more full blown.
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Man fears the pyramid, time fears man.