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this post was submitted on 18 May 2024
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Scientists may have solved the mystery behind transporting some of the materials to the pyramid site: a dried-up a river
Fixed the title for you.
The construction of the Giza pyramids is still baffling. Some of the stones are purported to weigh 80 tons. That's four or five times more weight than what modern trucks can pull on paved roads.
It's not so farfetched to presume that this ancient civilization employed technology that is lost to time. I'm not talking about aliens and laser beams, but good ol' fashioned mathematics. They could have exploited a principle of leverage and incline that we simply don't understand or recognize. Or perhaps something entirely different from our six simple machines...
The problem with this theory, of course, is that we like to believe that humanity is always progressing and that we are superior to our forebears by default. That is ultimately a subjective opinion.
You'd have a point if the Egyptians didn't already tell us how they moved giant, heavy things over land.
Lots of human labor.
(Relief from the tomb of Djehutihotep in el-Bersheh)
Yes. I'm familiar with this image. Some scientists claim that when just the right amount of water is poured over sand it reduces the friction by about 30%.
Some also claim that there were not hundreds of thousands of laborers at the Giza pyramids, based on evidence discovered in the work camps near the site.
I'm 38 years old and I think I've read about a new theory every year of my life...
Who are these "some scientists?" Names please.
I'd suggest arguing against what they literally showed us they did is an uphill battle.
"The study was done by Christian Wagner and colleagues at Saarland University in Germany, along with researchers in the Netherlands, Iran and France. The team was inspired by an ancient Egyptian wall painting showing a huge statue being hauled across the sand on a sledge in about 1800 BC. The painting has a detail that has long puzzled Egyptologists: a worker who appears to be pouring water onto the sand in front of the sledge while others appear to be carrying water to replenish his supply."
https://physicsworld.com/a/did-slippery-sand-help-egyptians-build-the-pyramids/
There are hundreds of articles about this theory. It was all the rage a few years ago.
You grease up a sled and drag it down a track carved into some rocks.
Even with the wrong amount of water, sticktion is just proportional to weight. With enough force you can overcome any amount of it.
How many horsepower is that? Also, what is a horse? (bronze age Egypt joke)
For the record we do understand how they built it.
They used log rollers, ropes and lots and lots of people hauling. They brute forced it… which, the reason our trucks can’t haul that much has far more to do with the weight on the suspension and fuel efficiency. They said fuck-all to efficiency and literally threw bodies at it.
That said, We do sometimes need much heavier loads
It’s a fairly common solution- the Moai heads on Rapa Nui (easter island) and stone henge also come to mind. In the case of Egypt, they used a sled (or sled and rollers.)
For getting it up the face, they used packed earth ramps that they later removed. Actually, we still use this technique in construction today. (Specifically to get vehicle access up otherwise too-steep slopes)(and again, threw bodies at it. Lots and lots of bodies.)
There’s really only a few things that are impressive about the pyramids. The first is the sheer ego it took to order it built. Then there is the celestial alignment between all of them. And finally the sheer scale of the project and vast amounts of human labor that went into it.
What they determined is that the river allowed the blocks to be floated much closer than previously thought (even today barges are superior to trains, never mind trucking.)
I lot of people look at this and say its just too much material for it to have happened.
But we know of projects that have used more man power. The London to Birmingham railway line took 5 years to build and moved more material than the great pyramid and we know exactly how that was done. The size of individual pieces does add complication, but the absolute quantity and manpower is not unexplainable.
Yeah, it's a failure of imagination, probably combined with wanting to believe.
I wonder if there’s a bit of not wanting to believe what people can accomplish if a massive number of us all teamed up to do something.
Because then they’d feel guilty for not getting up out of their armchair and going to support whatever cause they claim they’re supporting from the comfort of home.
Armchair activism is indeed a scourge.
There's a new theory that the ramps were actually internal. I like it because it means they don't need to bring a lot of extra material and manpower to the site just for the ramps since they're built into the structure of the same material.
I've also heard of this. It seems to me that this theory should be easy to confirm with some sort x-ray or radar or lidar or something, so that we can see the shape of the structure beneath the superficial layers...
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We do sometimes need much heavier loads
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Well, given that they didn't have trucks, that's a little unfair. Animals or people with ropes was the most efficient solution.
I swear that I'm not trying to be obtuse, but I have a lot of doubts.
What kind of ropes and wooden sleds, manufactured in 4000 BC, can move 80 ton stones? There are tensile limits...
So, each rope only needs to be too strong for the individual worker to snap. Obviously, that's pretty easy, even with the worst natural fiber cordage - fibers are strong. Then they meet in some way, and ultimately attach to the wooden sled. The exact math for that is not straightforward, and we don't really know how they tied it off, but it's not an unusual amount of load for a large wooden structure. Assuming the sled measured 100 meters^2^ (80 tons was a special block worthy of an oversize sled), that works out to less than a ton per square meter, and a tree with 1m^2^ cross section at the trunk can weigh several tons without even considering the wind load on the foliage, which will be larger yet for most species.
80 tons is a lot, but it's not a lot a lot. Thousands of tons are pretty common if you're talking about ships, for example. Even the wooden ones; honestly wood is an underrated material.
I don't know any specifics, but a bunch of ropes divides the force on each one. A bunch of ropes, plus people pushing from behind, would probably be enough force to overcome static friction without exceeding tensile limits on any one rope.
Yeah people really forget how recent an invention good rope is, It's not like they could just order a few hundred meters on ebay. Making all that rope would probably be more effort and expense than a lot of the stuff that people write of as too complex for them to have considered, like temporary canals or raise and drop sledding.
Rope braiding is pretty fast. Especially if you're an ancient Egyptian woman who's done it full time for decades. They had hemp, which is the same stuff that rigged up the giant sailing ships of later on in history.
This guy shows how to move large, heavy objects using pivot points and physics.
It sounds silly until you see him single handedly move a barn(!)
https://youtu.be/E5pZ7uR6v8c
Yeah, I remember this guy. He claimed that Stonehenge in England could have been built like this. The pyramids of Giza are much more complex, of course. Still, I think it's entirely possible that the pyramids were built using very clever engineering principles that were forgotten and that we don't need because we have cranes and power tools and hydraulics, etc.
That was very cool, thanks for sharing.
I would argue seeing the barn makes it even sillier, but in a good way.
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Isn't this old news? I heard this when Assassin Creed Origins came out and thought it was somewhat historically accurate.
So it's not just me. Maybe the discovery here was just the exact and complete layout, and the BBC misunderstood it the way journalists usually do with science stories?
Ah yes, the ancient Egyptian seven simple machines: lever, wheel, pulley, incline, wedge, screw and Agrav engine.
It’s impressive is year 2024, we sent robots to other planets and so many other technological achievements … and still dont know exactly how the the Giza piramids have been done .
We know several ways it could have been done, and we could do it ourselves for a sliver of the cost. It's a matter of historical preservation that we're not sure which they chose.
The uncertain of this specific case and a few others against other thousand of history remains is what makes wonder
We know more about pyramid construction than pretty much everything else that was going on in 2500BC.