 | Ancient Egyptian units of measurement: Encyclopedia - Ancient Egyptian units of measurement
Ancient Egyptian units of measurement
Ancient Egyptian standards of measure evolved over a period of several thousand years as a combination of two systems. The oldest Egyptian body measures date to the late Pre-Dynastic where the glyph for cubit measure is included in several palettes. The oldest glyphs related to agricultural measure show up on the palette of the Scorpion king which shows the firlds being dividfed up by irrigation ditches. One system was essentially decimal and used by surveyors to reestablish the metes and bounds of fields after the innundation or 3ht and to measure long distances such as roads and canals, and the other essentially septenary system was a cannon of proportions developed from body measures used in inscription grids and in the measure of commodities such as rations of grain and beer. Both systems were designed to be accounted for with unit fractions.
Ancient Egyptian units of measurement - the ro or portion
1 ro := ½ db
The word ro is found in the Akhmim Wooden Tablet and RMP as a common divisor, and in other texts with values other than 1/320. Therefore the use of ro as a simple volume unit is misleading. For example, to divide 1/3rd of a hekat scribes like Ahmes used the expression:
(64/64)/3 = 21/64 + 1/(3*64) such that ro was later introduced
= (16 + 4 + 1)/64 + (5/3)* ro, since 1/64 = 5/320
= (1/4 + 1/16 + 1/64) + (1 + 2/3)* ro
Note the binary (Horus-Eye) fractions in the first half of the statement and Egyptian fracions in the second half, with ro = 1/320 as a scaling factor in this case, and other cases for divisors n being less than 64.
The Akhmim Wooden Tablet lists 1/3, 1/7, 1/10, 1/11 and 1/13 problems in this manner, as do over 30 cases in the RMP itself, as Gillings sites with respect to hinu- data and several problems, one being #81. The AWT proves its answers by computing 3/3, 7/7, 10/10, 11/11 and 13/13 as G. Daressy first documented in 1906. The RMP does not prove its answers in the manner shown in the AWT.
The systematic standard or standards of length based on body measure and the systematic standard or standards based on distance derived from agricultural measures such as the irrigation ditch or plowed furrow differ in that agricultural units have an associated width.
Ro or parts of areas are found as strips such as the khet which is 100 cubits long by 1 cubit wide and the aroura which is 1000 orquia long by 1 orquia wide and laid out as a boustrehedron so that it contains 10 parallel strips of 1000 feet x 1 orguia wide
Ro of cubits can be palms or hands. The difference between palm based cubits before Egypt becomes a part of Persia, and hand based cubits which have slightly differentlengths and result in the different varieties of Greek pous or feet and Roman pes and consequently the different stadia of 500 remen = 222 m, 600 pous = 185 m, 625 pes = 185 m and 300 cubits = 157.5 m.
Agricultural measures are multiples of the foot, yard, nibw, (elle or double foot), pace, fathom, rod, and cord. Agricultural or areas measures thought of as lengths with a width based on the dimensions of plowed fields and result in stadia and chains.
Gardiner § 266 says the st3t is divided into rmn = 1/2 st3t
hsb = 1/4 st3t and s3 = 1/4 st3t
A thousand of land is equal to a sTAT because its a strip, the Greeks plowed boustrahedron.
The aroura (sTAt) is a mia chilioi or thousand (orquia or fathoms) of land plowed (as the ox plows). A distance of 6000 feet and a width of 6 feet, or 36,000 SF (Greek feet or pous of 308.4 mm) ;laid out back and forth in (10) 600 foot stadia strips. The sTAt would have the same area as the Aroura but a different arrangement being square rather than rectangular.
Gardiner says "A measure of ten arouras is written h3 literally thousand more fully h3 t3" thousand of land. That is not 10 arouras but one aroura divided into 10 parts.
"3ht n ht 10 r ht 2, a field of 10 rods by 2 rods"
Gardiner says there are both large and small itrw "irw n itrw 6 ht rmn hsb mh 4" ( makes an itrw [river measure] 6 rods of rmn hsb mh 4) or read as in the above example [1 itrw = 6 rods of rmn hsb by 4 mh]
A rod of cord of rmn hsb by 4 cubits is the side of 1/4 of 100 rmn or 37m, instead of 1/4 of 100 royal cubits. 6 rods is 222 m Thats the stadion of Marinus and Ptolemy and 1/50 of the larger itrw of 21,000 royal cubits implying a royal cubit used to measure distance thats in the range of 528.6 mm.
"3ht h3 2 st3t 2 literally 22 arouras of field" (a field of 2 thousands by 2 st3t = 4 st3t ?) "h3 4 st3t 2 rmn 42 1/2 arouras" " st3t 8 1/2 1/4 1/8 mh ro 1/2 1/4, 8 7/8 aroura 10 3/4 cubits or 89,825 square cubits.
Examining the accounts of land in the Wilbur papyrus, Khatary, "Land Tenure in the Rameside Period" speaks of fields measured in mh t3 or land cubits as well as aroura. The word Aroura is Greek for measuring reed (orquia)
The ro of both sets of standards are joined together before the 18tyh dynasty. From time to time and place to place there is substantive variation in things actually measured but the conceptual standards of measure remain the same. When Herodotus speaks of the Egyptian itrw as equivalent to 60 stadions he means its 210 sTAt.
Gardiner, Faulkner, Gilings, Wilkenson and Khatary discuss royal cubits being used to mark out sTAt with sides of 1 khet, but according to Gardiner, ht or rods of cord based on feet, ordinary cubits, remen, and nibw (elles or double feet)were all used as ro of the khet
1 rwy := 2/3 db
1 hmt rw := ¾ db
The lengths are from measures of surviving rulers with the caveat that the Egyptians of the 3rd millennium were not working to an accuracy of 2 decimal places.
Egyptians worked to 100% accurate standards when possible, which was 100% of the time in the case of hekat and cubit divisions. That is, there was no round off to 2 decimal places except for extreme situations, one being the use of the ratio pi.
Ancient Egyptian units of measurement - Special Unit Measures
The bw or foot is marked with the glyph mh for forearm or cubit spaced across the division between 15 and 16 fingers with 15 fingers being 3 hands and 16 fingers 4 palms.
Ancient Egyptian units of measurement - The Remen
The remen (5 palms) is interesting in that if it is the hypotenuse of a triangle (3:4:5) and one of the sides is a foot (4 palms or 3 hands), then the other side is a span (3 palms) similarly if the ordinary cubit is used as the short side (3) then the double remen (10 palms) can be the long side (5) and the nibw (8 palms) becomes the middle side (4).
Ancient Egyptian units of measurement - The h3yt or rod
The next multiple used by the Egyptians was the h3yt or rod of 10 royal cubits as in the Mesopotamian system. 10 h3yt were used as a ht of 100 cubits or ht n nhw a rod of cord to mark the side of an 3ht or field the Greek aroura or area is literally h3 t3 or a thousand of land.
Ancient Egyptian units of measurement - The Itrw and Atur
For longer distances the Egyptians used a minute of march of 350 royal cubits and an atur (hour of march) or itrw (river journey) of 21,000 royal cubits.
Ancient Egyptian units of measurement - Area
1 st3t spd := 1/5 st3t, a field of sides 100 spd ≈ 500 m²
550 m², 5625 ft²
1 st3t mh bw := 1/3 st3t, a field of sides 100 mh bw ≈ 900 m²
916_2/3 m², 10,000ft²
1 st3t remen := 1/2 st3t, a field of sides 100 remen ≈ 1400 m²
1375 m², 15,000 ft²
1 st3t khet : a field of sides 100 ordinary cubits 2000 m² 21,000 ft²
1 st3t : a field (3ht) of sides
100 royal cubits or 1 ht n nhw ≈ 2750 m² 30000 ft²
Ancient Egyptian units of measurement - Volume
1 hekat, hk3t := 1/30 royal cubit³ ≈ 4.8 l, used for grain
1 oipe, ipet := 4 hekat ≈ 19 l
1 jar := 5 oipe ≈ 96 l
1 hinu := 1/10 hekat ≈ 0.48 l, used for perfume as well as grain
1 ro := 1/32 hinu ≈ 0.015 l
1 des :≈ 0.5 l, for liquids
secha : for beer
hebenet : for wine
Fractions of ½, ¼, 1/8, 1/16, 1/32 and 1/64 hekat,
by an “Eye of Horus” rule, were also in use for breead and beer.
Ancient Egyptian units of measurement - Weight
1 deben :≈ 91 g, normally of copper, but
also silver, gold and probably lead. Also used as money.
1 qedety := 1/10 deben
shaty: 1/5 silver deben or 1/3 lead deben
Ancient Egyptian units of measurement - Time
year: The 365 day year was introduced by 2773 BC
Ancient Egyptian units of measurement - Calculation of slope by unit rise and run
seked, seqt: Unit of inclination. Indicates horizontal dimension
measured in palms (and digits fractions as necessary)
per vertical Royal cubit rise, e.g. 5 seked is 54.46°,
5¼ seked is 53.13°, 5½ seked is 51.84°.
Aroura, Itrw, Khet, Pes, Pous, Rope stretchers, Sos
See also
- Aroura
- Itrw
- Khet
- Pes
- Pous
- Rope stretchers
- Sos
Other related archives2773 BC, Aroura, Horus, Itrw, Khet, Pes, Pous, Rope stretchers, Sos, beer, g, grain, measure, proportions, surveyors, system, unit fractions
 Adapted from the Wikipedia article "Ancient Egyptian units of measurement", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
