February 17, 2020 04:44AM
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Registered: 14 years ago
Posts: 1,243
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Good question, which Petrie attempted to answer rather badly.
Petrie suggested a run of 5 for a slope length of 7 as the only likely slope.
Petrie determined the mean slope as 44 degrees 36 seconds.with all sides within 6 arc minutes, as judged from the core masonry, so claimed must be within 3 arc minutes, but I think Petrie's calculation of the theoretical angle from cosine = 5/7 is wrong.
Petrie claimed this would give a theoretical slope of 44 degrees 34 minutes 40 seconds, but this is incorrect by nearly 10 arc minutes.
Verner reported slope as 45 degrees, so let's go with an angle of 45 degrees for the time being which has much to commend it as a rise of one cubit for a run of one cubit.
The real big problem is that lots of authors quote a much less angle beginning with Vyse who reported an angle of 43 degrees 36 minutes 11 seconds. Is that likely?
Petrie pointed out that this was an error of apparently precisely 1 degree (60 arc seconds).
Petrie measured four angles as precisely the same within 6 arc minutes. Is he likely to be wrong?
Does Dorner agree with Vyse or Petrie on the slope?
What is the slope according to Maragioglio & Rinaldi? I have their report on the Bent Pyramid, but not for the Red Pyramid.
There is no point promoting my model if someone has proved that Petrie was wrong in his determination of the slope.
Thanks for your question.
Mark
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