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Its a one of anomoly afaic - and drawing any conclusions at all from it seems unlikely.
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Naguib Victor, on the other hand, maintains that the nbj had a length of 70 cm which was divided into seven parts; and he has traced the use of this measurement in a number of rock-cut tombs from as early as the Old Kingdom.
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www.legon.demon.co.uk]
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Petrie, Section 92, cites a very fine stone standard, 26.9 X 12.75 X 2.3 to 3.0 thick, upper surface finely smoothed, with inscribed palm lines across the breadth, Mean range error of straightness and parallelism of 0.007 inches. The mean distance of the palms between lines is 3.829, mean difference of 0.006.
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www.egyptorigins.com]
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A much less often mentioned linear measure is the nbiu 'nebiu', [lit. 'pole'] perhaps equal to 1 1/4th or 1 1/3rd cubit. - Gardner 'Egtpian Grammar'
