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The casing stones were laid on an inclined bed which affects the overal angle of the slope.
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81. For the angle of the Pyramid, the data are rather divergent and not only do different methods vary in result, but the measures of similar stones vary far beyond the errors of measuring the angle or judging of the surfaces.
By 7 measures on finished granite, in situ. 50º 57' ± 28"
By 1st and 4th courses, in situ. at S.S.W. 50º 42' ± 07"
By 6 single blocks of granite, shifted 51º 00' ± 09"
By 9 pieces of limestone casing (brought to England) 51º 58' ± 15"
Considering the various sources of error : that the dressed granite in situ. is very irregular; that the 1st course joint at S.S.W. may easily be estimated too far out; and that we have no guarantee in the moved granite blocks, or the limestone from the upper part, that the courses were horizontal (on the contrary, one granite block has two different joint surfaces, 1º 40' different); the best conclusion seems to be 51º 0' ± 10'. But from a consideration of the granite courses (see below), the angle would be 51º 10' 30" ± 1' 20"; and this might well be adopted, as being close to the very uncertain result from the measured angles.
Hence the height of the Pyramid would have been 2564 ± 15; or 2580.8 ± 2.0 by the granite courses.
Any shfted and out of position casing is useless. That leaves
By 7 measures on finished granite, in situ. 50º 57' ± 28"
By 1st and 4th courses, in situ. at S.S.W. 50º 42' ± 07"
With the 50º 57' ± 28" probably being the most reliable over a greater area.
1/ (tan 50.95) * 28 = 22.7144
1/ (tan 50.7) * 28 = 22.9177
atan 23/28 = 50.599 degrees (50º 36')
Personally I think this is really stretching but....
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Menkaura's slope was probably based on seked 5 1/2.
gives atan 28/22 = 51.8427 (51º 50.5') which is considerably worse.
The only other observation is to go by the 16 granite course as 1/4th height in which case there is definitlely no seked.
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(4153.6 / 2 / 2581) * 28 = 22.5302 [Eh ?]
Sorry Chris. I Cant see it for these reasons.
