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Story Spotlight

Pyramid of Khufu (by Bradipus, Creative Commons Licence)

A new paper on arXiv.org offers a novel solution to the mystery of how the ancient Egyptians moved millions of massive stone blocks around: by rolling them inside a 12-sided wooden frame. Noting the orthodox theory - that the blocks were put on sleds which were pulled, with the sand in front of the sled being constantly lubricated with - results in a not insignificant level of friction, they suggest that the dodecagon idea would be a far more efficient method of moving these heavy blocks:

As an alternative to dragging large blocks, one can consider
rolling the blocks. Rolling a prism of 4 sides is not efficient, but
adding wooden rods to the surface can effectively increase the number of sides. The crew can then pull on a rope wrapped around and passing over the top of the block. In this configuration, static friction acts in the direction of the desired motion, rather than opposing the motion. In effect the block and rope combination becomes a 2:1 pulley, though the pulley was not yet formally "known" to the Egyptians at that time. The rods can be re-used many times, and there is no need to to transport large quantities of water for lubrication.

...By attaching 12 identical wooden rods to the faces of the block, one effectively transforms the block into a dodecagon prism with very little added mass, much lower ground pressure, and with good cross country mobility... It would seem that some variation of rolling the blocks should now be considered to be among the “best” and most likely method used to move the stones for the great pyramids

The paper goes into more of the physics behind the idea, as well as offering some experimental data to back the authors' theory up.

(h/t Norman R.)

Link: How they (should have) built the pyramids

You might also like: Has This Retired Construction Worker Figured Out How Stonehenge Was Built?

 

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(Posted by Greg on Tuesday, August 26th)

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Quote of the Day:

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Buckminster Fuller

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