December 13, 2007 06:29AM
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Registered: 18 years ago
Posts: 3,316
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Hello Graham,
The following is extracted from Petrie's
Pyramids and Temples of Giza 1883:
For the value of the usual cubit, undoubtedly the most important source is the King's Chamber in the Great Pyramid; that is the most accurately wrought, the best preserved, and the most exactly measured, of all the data that are known. The cubit in the Great Pyramid varies thus:—
By the base of King's Chamber, corrected for opening of joints 20.632 ± .004
By the Queen's Chamber, if dimensions squared are in square cubits 20.61 ± .02
By the subterranean chamber 20.65 ± .05
By the antechamber 20.58 ± .02
By the ascending and Queen's Chamber passage lengths (section 149) 20.622 ± .002
By the base length of the Pyramid, if 440 cubits (section 143) 20.611 ± .002
By the entrance passage width 20.765 ± .01
By the gallery width 20.605 ± .032
The passage widths are so short and variable that little value can be placed on them, especially as they depend on the builder's and not on the mason's work. The lengths of the passages are very accurate data, but being only single measures, are of less importance than are chambers, in which a length is often repeated in the working. The chamber dimensions are rather variable, particularly in the subterranean and Antechamber, and none of the above data are equal in quality to the King's Chamber dimensions. If a strictly weighted [p. 179] mean be taken it yields 20.620 ± .004; but taking the King's Chamber alone, as being the best datum by far, it nevertheless contracts upwards, so that it is hardly justifiable to adopt a larger result than 20.620 ± .005."
I think it explains the situation quite clearly.
The royal cubit employed throughout the Pyramid was equivalent to 20.632”
The different rc lengths Petrie mentions are only the result of an actual dimension being divided by an assumed convenient number of royal cubits.
For example, the east wall of the Queen’s Chamber is from 205.6” to 205.79” wide.
It is then assumed by some that this measurment is equivalent to 10 royal cubits.
Therefore, the length of the royal cubit in the Queen’s Chamber must be 20.56” to 20.58”.
As I posted earlier, the reality is that the width of the QC’s east wall is a mean 9.973 royal cubits of 20.632”.
Not liking the number 9.973 is no reason to change it to 10, but, well, some folks can’t resist doing it.
Another example is the length of the Ascending Passage floorline.
It is actually 1546.8” long.
In royal cubits of 20.632” this is equivalent to 74.971rc.
Unfortunately, some people find the number 74.971 unacceptable and insist that it should be 75.
Consequently, we end up with an AP royal cubit of 1546.8” divided by 75 = 20.624”
The same thing happens with the lengths of the Pyramid’s sides at the base.
The north side’s 439.371rc of 20.632” becomes 440rc of 20.60”
The south side’s 439.753rc of 20.632” becomes 440rc of 20.62”
The east side’s 439.633rc of 20.632” becomes 440rc of 20.61”
The west side’s 439.57rc of 20.632” becomes 440rc of 20.61”
Some people simply can’t handle the 439.xxx numbers; they have to have nice round numbers to play with, so we end up with 440 royal cubits of 20.61” +/- 0.1”
And so it goes on, and it is all completely unnecessary and totally misleading.
MJ
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Clive |
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Morph |
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fmetrol |
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Morph |
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Jammer |
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Dave L |
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Clive |
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Pistol |
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MJ Thomas |
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Clive |
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Jammer |
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Clive |
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fmetrol |
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Clive |
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Anthony |
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fmetrol |
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Jammer |
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Clive |
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Clive |
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Jammer |
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Warwick L Nixon |
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Greg Reeder |
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fmetrol |
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Greg Reeder |
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fmetrol |
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fmetrol |
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Clive |
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fmetrol |
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MJ Thomas |
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Anthony |
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L Cooper |
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Hermione |
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