The Dendera 'Light bulb'

[DPKing]

What kind of stone is that, limestone?

Do you know what happens when limestone gets too hot? It turns into quicklime. If those stones are limestone and they used high temperatures (above 600º C) the stones would turn into quicklime and crumble.
And the ammonia would probably react with it too, but was never good at chemistry.

Not sure the melting point is significant

"Limestone blocks generally fuse together—or more accurately, begin to sinter and melt—at temperatures exceeding 900°C to 1500°C (1652°F to 2732°F). The process is highly dependent on the presence of impurities (like silica or clay), which can lower the melting point"

But whether the stones could be made water proof under pressure I think is a legit point.  Presumably up close to the compressed area would be extremely hot.  I believe they figured out a way to make it happen, however I see from this discussion someone is going to have to build a small scale version to prove it

[Hanslune]

When you get to temperatures above 825°C, limestone (calcium carbonate, ) decomposes through a process called calcination, breaking down into quicklime (calcium oxide, ) and releasing carbon dioxide ( ) gas. This chemical breakdown is essential for creating cement and lime. Physically, heat causes limestone to expand, lose strength, and develop cracks above 400°C. Chemical and Physical Changes at High Temperature:
Chemical Reaction: The primary reaction is:  . The solid limestone turns into powdery calcium oxide, often turning white in the process.
Thermal Decomposition (Calcination): While some decomposition starts earlier, active decomposition occurs heavily around 825°C–900°C.
Physical Degradation: As temperature rises, limestone strength degrades and its elastic modulus drops significantly, especially above 400°C, due to internal microcracks.
Color Changes: Limestone often changes color to white upon heating, with some types turning red or gray around 400–600°C.
Structural Damage: Extremely high temperatures, such as those in a fire, cause the rock to expand, crack, and potentially break down (disintegrate).

Limestone is NOT the stone you use if dealing with pressure or heat

[ArMaP]

Not sure the melting point is significant

I was not talking about melting, I was talking about what happens at temperatures well below melting point.

That was one of the oldest methods of making a kind of mortar: make a kind of hoven, fill it with wood and limestone, bur the wood for several hours and you will get quick lime. Put the quick lime in water and it will make a chemical reaction that reaches temperatures well above the water boiling point. It then turns into a kind of paste that can be mixed with sand to make a kind of cement or plaster.

This process has been used for thousands of years, and I saw men at building sites using the last part (mixing the quick lime with water) to make plaster. My brother knew a boy that was blinded by a drop of water that was thrown by that process when he was working on a construction site. Besides the temperature it reaches in the process, quick lime is also strongly caustic.

My point of view is that, if that stone is limestone then it could not have been used at high temperatures, as it would have turned into quick lime and eventually destroyed, as quick lime is not hard.

Back on topic (more or less), quicklime, when heated to very high temperatures, gives a strong light, that's what they used on limelights, so although not a light bulb, it can be used to give light.

[Hanslune]

My point of view is that, if that stone is limestone then it could not have been used at high temperatures, as it would have turned into quick lime and eventually destroyed, as quick lime is not hard.

Back on topic (more or less), quicklime, when heated to very high temperatures, gives a strong light, that's what they used on limelights, so although not a light bulb, it can be used to give light.

Quicklime (calcium oxide) produces intense light through incandescence - glowing due to high heat. In the 19th-century "limelight," was produced by using an an oxyhydrogen flame (approx. 2800°C) directed at a cylinder of quicklime. Whether the Egyptian had OH is questionable

[Byrd]

Not sure the melting point is significant

"Limestone blocks generally fuse together—or more accurately, begin to sinter and melt—at temperatures exceeding 900°C to 1500°C (1652°F to 2732°F). The process is highly dependent on the presence of impurities (like silica or clay), which can lower the melting point"

But whether the stones could be made water proof under pressure I think is a legit point.  Presumably up close to the compressed area would be extremely hot.  I believe they figured out a way to make it happen, however I see from this discussion someone is going to have to build a small scale version to prove it

Don't know where you got that information, but limestone doesn't melt: https://biologyinsights.com/what-is-the-...-of-stone/  At the temperature you mention, it decomposes, as people have been saying.

Limestone is also porous.  That's why you have caves in limestone and why aquifers are limestone.  Water erodes limestone VERY quickly!

Scale models aren't necessary.  It's clear this isn't workable.

[Wepwawet]

Context, what is the context for where any pyramid in Egypt is, well they're all in necropoli, and why would that be. More context, why have supposed industrial buildings in a pyramid shape, a shape that mirrors the rays of the Sun, and also probably represents the primeval mound.

I've read Dunn's book, and others, including very many forum posts on this, and I find that they all lack any meaningful context tying pyramids to the Ancient Egyptians. Various folks focus on the Great Pyramid like a laser beam, yet make no attempt, in fact actively avoid any attempt to discuss the AE, their burial practises and religion. Dunn and co cannot be taken seriously while they exhibit insufficient knowledge about the Ancient Egyptians, including their written language, a huge block to them, and I saw it mentioned in an earlier post that what we see in the Dendera illustrations is described in hieroglyphs with them. The same goes for the "helicopters" in the Seti I temple at Abydos. Lack of knowledge, and in most cases obtuseness, causes people to make utter fools of themselves, but they are not deterred, madness.

Well, first post here and a polemic, meh. So, hello and all that, but seeing familiar names in this thread, and perhaps some writing styles even if the name is unfamiliar, it's hardly hello, just carrying on. Is this the lifeboat ?

[IdeomotorPrisoner]

Context, what is the context for where any pyramid in Egypt is, well they're all in necropoli, and why would that be. More context, why have supposed industrial buildings in a pyramid shape, a shape that mirrors the rays of the Sun, and also probably represents the primeval mound.

I've read Dunn's book, and others, including very many forum posts on this, and I find that they all lack any meaningful context tying pyramids to the Ancient Egyptians. Various folks focus on the Great Pyramid like a laser beam, yet make no attempt, in fact actively avoid any attempt to discuss the AE, their burial practises and religion. Dunn and co cannot be taken seriously while they exhibit insufficient knowledge about the Ancient Egyptians, including their written language, a huge block to them, and I saw it mentioned in an earlier post that what we see in the Dendera illustrations is described in hieroglyphs with them. The same goes for the "helicopters" in the Seti I temple at Abydos. Lack of knowledge, and in most cases obtuseness, causes people to make utter fools of themselves, but they are not deterred, madness.

Well, first post here and a polemic, meh. So, hello and all that, but seeing familiar names in this thread, and perhaps some writing styles even if the name is unfamiliar, it's hardly hello, just carrying on. Is this the lifeboat ?

Lets just blame Zachariah Sitchin like theologian Michael Heiser used too... They all follow the "we can do whatever with our supporting evidence" model. 

But the ancient Egypt ones are silly. Very silly at times, and its time to give the bronze age more credit for their ingenuity and problem solving.  They could lift and move 500 ton obelisk. 

You can even see their "advanced" trial and error with the bent pyramid., where they learned to golden degrees of slope to building really tall piles of rocks for the stars. 

So Ancient Aliens type things just make me want to explain that levitating blocks arent needed. Pulleys and counterweight, lots of rope, sleds, and high capacity barges to move blocks to an internal ramp is enough... 

Even if they still connected the star Sirius to The Nile Flood because they coincided in July, 

And I love that they have advanced technology like levitation to move chronologically accurate building material, like stone.

i said this already, but i HATE the "lightbulb" 

IT'S A SNAKE - COMING OUT OF A LOTUS FLOWER - FROM THE PRIMORDIAL SEA! 

It is a creation myth. A multi-part relief in The Temple of Hathor.  

And you can say we know what the Egyptians said. They narrated the beliefs. There is NO ambiguity. Egypt was more than able to tell complex storys with heiroglyphs.

[Runespider]

Context, what is the context for where any pyramid in Egypt is, well they're all in necropoli, and why would that be. More context, why have supposed industrial buildings in a pyramid shape, a shape that mirrors the rays of the Sun, and also probably represents the primeval mound.

I've read Dunn's book, and others, including very many forum posts on this, and I find that they all lack any meaningful context tying pyramids to the Ancient Egyptians. Various folks focus on the Great Pyramid like a laser beam, yet make no attempt, in fact actively avoid any attempt to discuss the AE, their burial practises and religion. Dunn and co cannot be taken seriously while they exhibit insufficient knowledge about the Ancient Egyptians, including their written language, a huge block to them, and I saw it mentioned in an earlier post that what we see in the Dendera illustrations is described in hieroglyphs with them. The same goes for the "helicopters" in the Seti I temple at Abydos. Lack of knowledge, and in most cases obtuseness, causes people to make utter fools of themselves, but they are not deterred, madness.

Well, first post here and a polemic, meh. So, hello and all that, but seeing familiar names in this thread, and perhaps some writing styles even if the name is unfamiliar, it's hardly hello, just carrying on. Is this the lifeboat ?

 Dunn and others make a conspicuous effort to not bring in comparisons to other civilizations that cut granite. 
 
 I don't know the numbers off hand but it seems like the amount of Granite the Romans used was comparable to Ancient Egypt even with the shorter time frame. 
 But you never see ideas of laser cutters or circular saws around the sarcophagi of St Helena for example. 
 
That said of course, no one's successfully been able to rule out cold water geysers.

[Runespider]

Lets just blame Zachariah Sitchin like theologian Michael Heiser used too... They all follow the "we can do whatever with our supporting evidence" model. 

But the ancient Egypt ones are silly. Very silly at times, and its time to give the bronze age more credit for their ingenuity and problem solving.  They could lift and move 500 ton obelisk. 

You can even see their "advanced" trial and error with the bent pyramid., where they learned to golden degrees of slope to building really tall piles of rocks for the stars. 

So Ancient Aliens type things just make me want to explain that levitating blocks arent needed. Pulleys and counterweight, lots of rope, sleds, and high capacity barges to move blocks to an internal ramp is enough... 

Even if they still connected the star Sirius to The Nile Flood because they coincided in July, 

And I love that they have advanced technology like levitation to move chronologically accurate building material, like stone.

i said this already, but i HATE the "lightbulb" 

IT'S A SNAKE - COMING OUT OF A LOTUS FLOWER - FROM THE PRIMORDIAL SEA! 

It is a creation myth. A multi-part relief in The Temple of Hathor.  

And you can say we know what the Egyptians said. They narrated the beliefs. There is NO ambiguity. Egypt was more than able to tell complex storys with heiroglyphs.

 It's also Ptolemaic, not technically what most people mean by ancient Egyptian. Always wondered how much that influenced the depiction. 
 Of course they will just claim it's super ancient, actually. Or hidden knowledge by a secret cult or something. 
 
 Not really related but I always think about stories. We have the ones of cultures that developed writing, and some stuff that was maintained by tradition with various degrees of outside influence. There's reconstructions of paleo indo European legends. 
 
 But take Gobekli Tepe. 
The Tas Tepeler culture was definitely impressive, especially for their time. They inhabited an area that made it feasible to live there year round from the amount of food available. 
 What were their legends like? 
 Did they see themselves as uniquely blessed like the Ancient Egyptians did? What did they think about other people who maintained a nomadic lifestyle. Or when agriculture started to develop. 
 What did they think as the region started to dry out? 
Did the  people of Nevla Cori have a similar legend to the biblical fall of man, remembering stories from their ancestors when they had to do very little to feed themselves compared to the agriculture their descendants practiced.

[Wepwawet]

 
 
That said of course, no one's successfully been able to rule out cold water geysers.

Oh god no, anything but these damn geysers. He isn't here, is he :)