> Jon Ellison Wrote:
> What is zero slippage ratchet system? Are you
> saying the ceiling blocks are dovetailed into the
> side walls? Could you speaka da layman's English
Endless apologies Madam.
First of all I believe that the builders were very smart and knew exactly what they were doing. There's nothing primitive about this structure.
It's been claimed in the past that the ceiling blocks are arranged in a "ratchet" fashion.
In that the top course of wall blocks are cut in a 'saw tooth' profile, each ceiling block sitting into each corresponding 'saw tooth' in order to prevent the total weight of the ceiling blocks, which are set on the slope of the GG from cumulatively bearing down on the north wall.
This is similar to a "Ratchet and Pawl" mechanism. for example the mechanism that prevents you from winding a watch backwards.
HOWEVER... There has been no attempt by the builders to adopt this arrangement between any of the sidewall courses below the ceiling. Therefore every block in every wall course is bearing down cumulatively toward the north.
Rule Number One.. If you anchor into something, make sure that whatever you are anchoring into is also anchored.
I'm sure you agree that there is little point in securing ceiling blocks into a top course that is un-secured.
There's no need whatsoever to secure the ceiling blocks in this way. Just like every other block in the pyramid, they are supported by the block beneath it, both vertically downward and/or at the appropriate vector angle.
I get the impression that the "ratchet" explanation is an antiquarian attempt to explain something without actually thinking it through. There are a number of sloping passages elsewhere with the same ceiling blocks where no attempt has been made to adopt a ratchet system.
It's a miss-identification of function, just like the corbel walls, the relieving chambers and the AP girdle stones to name but few..
So the question is...
Why did they go to a great deal of trouble to arrange these ceiling blocks, vertically staggered, with a 28 degree up angle from horizontal that we see today?
There was obviously a functional design constraint that we are not aware of.
Unless of course they were complete idiots, and I find that hard to buy.
They were very good at building large pyramids, they have also demonstrated that they understood structural dynamics.
Inexplicable engineering. Inexplicable for us because we have no idea what they were trying to achieve.
Many visitors have noticed that when standing at the top of the GG, adjacent to the antechamber that even the quietest whisper made at the lower end can be clearly heard. Which is hardly surprising as the whole GG is a perfectly designed acoustic mirror. Angled ceiling blocks an' all.
A "whispering gallery".
Here's a rough sketch of two central, single bounce modes, the modes to the north and south are more complex.
A veritable pool table where whichever way you shoot the ball, it always winds up in the pocket.
There may be a relationship between the angled ceiling blocks and the lower sockets.
Those angled ceiling blocks saved them an awful lot of trouble, the alternative would have been an increase in the overall ceiling angle relative to the floor.
My biggest problem is in establishing exactly how many ceiling blocks there are.
I'd also like a photo of the convex curved ceiling block at the north end.
Edited 1 time(s). Last edit at 16-Dec-16 15:04 by Jon Ellison.