QUOTE(fantazum @ Dec 28 2005, 04:00 PM) [snapback]995871[/snapback]
the congregation shall await the coming of wednesday and your revelations with trembling anticipation.....
Ahhh, if only I had something grander to say...
As some of you know, I have many demands on my time, although I will usually try to spare a half hour in the morning and evening to post in this fantastic forum. I dislike making the sort of declarative statements I am about to make without posting sources, but I haven't had the time. I will promise this, though: if you are unwilling to take my word or accept my logic, I will happily spend some time on my weeked to find the sources that will allow you to get a second opinion on what I say.
Now that the disclaimer is out of the way, the question asked was how the ancient Egyptians worked the hard stone that makes up parts of the pyramid.
The first thing to realize is that the stonework on the pyramid is the same as the stonework on all the Egyptian temples, tombs, and other masonry. When this question is asked in context of the pyramid, the implication is that this is a problem that applies solely to the Great Pyramid, and not the the other 100+ pyramids in the area, or the thousands of buildings and temples that they built. The ancient Egyptians were a good several hundred years advanced in the art of stonemasonry, compared to the other civilizations, and working the granite, while tedious, was nothing mysterious. It was, in fact, commonplace.
Now, granite comes in various forms, of course, and the great majority of the pyramid is made from the softer sort that can be worked relatively well with the copper tools. By the great majority, what I am refering to is the 'fill-in' stone used inside the pyramid. Unlike the harder andesite granite that made up the load-bearing walls of the corridor and the outer framework of the pyramid (not to be confused with the limestone facing), this granite was generally cut into rough-hewn blocks approximately 2x2x2 feet in dimension, weighing roughly from half-a-ton to two tons. The sole purpose of these blocks was to support the weight above them, so the precision and degree that we see in the external casings was not needed here. The gaps between these blocks was filled in with rubble, most likely from the excavations that were going on simultaneously for the chambers built into the bedrock.
The question, then, isn't about the softer stones (I trust the logic of working a soft stone with a hard tool makes sense to all here?), but rather of the harder, more precisely cut stone which makes the pyramid's accuracy so famous. This granite's hardness is just below that of the copper tools the Egyptians used. To attempt to shape the hard stone with these tools would lead to rapid dulling, and a single block would require an army of coppersmithys to keep the stonemason working steadily. Fortunately, the Egyptians had better ways.
The rough-hewn blocks were made in the same way that the softer blocks where made. Instead of using the copper tools for fine work, they were instead used for basic chiseling. Deep and narrow holes were made in tight rows, and then stuffed with a dried, porous wood. A small barrier of clay was placed around the hole, and water was poured into it. Over the period of 24 hours, the water would soak into the wood, making it expand, and eventually making the large granite block split off from the original piece. Smaller blocks were made in the same way, until the block was in managable 10 ton pieces that could be maneuvered around by experienced quarrymen.
So, how do we get from a rough-hewn block of hard granite to the smooth surface that would be needed for the casing and framework? The sides of the block are pitted with bumps and hollows, and, again, using copper tools would be costly and time consuming, due to the slight difference in hardness. The Egyptians employed a different solution. They used a hard stone called dolerite, fashioned into round hammers. They quite literally 'banged' the rough surfaces of the block down, pulverising the bumps until a smooth, flat surface remained. Depending on the degree of flatness they need, they would then use an abrasive mixture of quartz sand to finish it off. It was time-consuming and labor-intensive, however it was leaps and bounds ahead of the technology employed by most other societies, who were still trying to unravel the mysteries of the mud-brick.
What has made this a mystery is viewing the past through the eyes of the present. In the modern era, we tend to view things from the brute force approach. Using hardened steels and tungsten tips, we rip out granite from the ground on our own terms. With motorized grinders and buffers, we shape and polish stone. When we hear about the ancient Egyptians employin soft copper on hard stone, we try and invision a copper blade sawing a block in half, much as our blade do. Obviously, this would be a total failure. Copper is simply not strong enough. In the ancient past, technique was the key to everything. Copper chisels dulled quickly, but were easy to sharpen, unlike copper blades. Dolerite hammers, for all intents and purposes, shaped themselves; as they wore down on one side, the stonemason merely turned the tool to a different face and continued.
I apologize for the short blurb, and I will be happy to expand on any questions that anyone might have.