Rope stretcher

rope stretchersstretching the cord
In ancient Egypt, a rope stretcher (or harpedonaptai) was a surveyor who measured real property demarcations and foundations using knotted cords, stretched so the rope did not sag.wikipedia
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Knotted cord

In ancient Egypt, a rope stretcher (or harpedonaptai) was a surveyor who measured real property demarcations and foundations using knotted cords, stretched so the rope did not sag.
Knotted cords were used by rope stretchers, royal surveyors who measured out the sides of fields (Egyptian 3ht).

Surveying

surveyorsurveyland surveyor
In ancient Egypt, a rope stretcher (or harpedonaptai) was a surveyor who measured real property demarcations and foundations using knotted cords, stretched so the rope did not sag.
In ancient Egypt, a rope stretcher would use simple geometry to re-establish boundaries after the annual floods of the Nile River.

Ancient Egypt

EgyptEgyptianAncient Egyptian
In ancient Egypt, a rope stretcher (or harpedonaptai) was a surveyor who measured real property demarcations and foundations using knotted cords, stretched so the rope did not sag.

Measurement

measuremeasuringmeasurements
In ancient Egypt, a rope stretcher (or harpedonaptai) was a surveyor who measured real property demarcations and foundations using knotted cords, stretched so the rope did not sag.

Real property

landimmovable propertyrealty
In ancient Egypt, a rope stretcher (or harpedonaptai) was a surveyor who measured real property demarcations and foundations using knotted cords, stretched so the rope did not sag.

Foundation (engineering)

foundationfoundationsfootings
In ancient Egypt, a rope stretcher (or harpedonaptai) was a surveyor who measured real property demarcations and foundations using knotted cords, stretched so the rope did not sag.

Theban Necropolis

NecropolisWest Bankburial grounds
The practice is depicted in tomb paintings of the Theban Necropolis.

Special right triangle

isosceles right triangleSpecial right triangles30-60-90
Rope stretchers used 3-4-5 triangles and the plummet, which are still in use by modern surveyors.

Plumb bob

plumb lineplumb-bobplummet
Rope stretchers used 3-4-5 triangles and the plummet, which are still in use by modern surveyors.

Early Dynastic Period (Egypt)

Early Dynastic PeriodEarly DynasticEarly Dynastic Period of Egypt
This important ceremony, and therefore rope-stretching itself, are attested over 3000 years from the early dynastic period to the Ptolemaic kingdom.

Ptolemaic Kingdom

Ptolemaic EgyptPtolemaicEgypt
This important ceremony, and therefore rope-stretching itself, are attested over 3000 years from the early dynastic period to the Ptolemaic kingdom.

Ancient Greece

Greekancient Greekancient Greeks
Rope stretching technology spread to ancient Greece and India, where it stimulated the development of geometry and mathematics.

India

IndianRepublic of IndiaIND
Rope stretching technology spread to ancient Greece and India, where it stimulated the development of geometry and mathematics.

Geometry

geometricgeometricalgeometries
Rope stretching technology spread to ancient Greece and India, where it stimulated the development of geometry and mathematics.

Mathematics

mathematicalmathmathematician
Rope stretching technology spread to ancient Greece and India, where it stimulated the development of geometry and mathematics.

Gromatici

Trigonometry

trigonometrictrigonometricaltrigonometrically

History of variational principles in physics

variational principle
The rope stretchers of ancient Egypt stretched corded ropes between two points to measure the path which minimized the distance of separation, and Claudius Ptolemy, in his Geographia (Bk 1, Ch 2), emphasized that one must correct for "deviations from a straight course"; in ancient Greece Euclid states in his Catoptrica that, for the path of light reflecting from a mirror, the angle of incidence equals the angle of reflection; and Hero of Alexandria later showed that this path was the shortest length and least time.

Seshat

SeshaitSeshat's emblem
Seshat assisted the pharaoh in the "stretching the cord" ritual.