Geodesic
Fractions for $\sqrt{2}$, $\sqrt{3}$, $\sqrt{5}$, quasi-pythagorean triples and the appearance of the royal cubit, foot and inch in Egypt during the Old Kingdom. Part II
Matematičeskoe obrazovanie, Tome 105 (2023) no. 1, pp. 54-66

Voir la notice de l'article provenant de la source Math-Net.Ru

It is hypothesized that in the Old Kingdom, after finding the fraction 47/21 for $\sqrt{5}$, discovered by Shchetnikov when analyzing the proportions of the burial chamber of the Great Pyramid, an inch was introduced as 1/21 of the royal cubit. Examples are given from architecture and religious art in which the inch was used. 
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     author = {A. N. Kovalev},
     title = {Fractions for $\sqrt{2}$, $\sqrt{3}$, $\sqrt{5}$, quasi-pythagorean triples and the appearance of the royal cubit, foot and inch in {Egypt} during the {Old} {Kingdom.} {Part} {II}},
     journal = {Matemati\v{c}eskoe obrazovanie},
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A. N. Kovalev. Fractions for $\sqrt{2}$, $\sqrt{3}$, $\sqrt{5}$, quasi-pythagorean triples and the appearance of the royal cubit, foot and inch in Egypt during the Old Kingdom. Part II. Matematičeskoe obrazovanie, Tome 105 (2023) no. 1, pp. 54-66. http://geodesic.mathdoc.fr/item/MO_2023_105_1_a6/