# 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**

### Real property

**landimmovable propertyrealty**

### Foundation (engineering)

**foundationfoundationsfootings**

### 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**

### Gromatici

**AgrimensoragrimensoresGromatici Veteres**

### Trigonometry

**trigonometrictrigonometricaltrigonometrically**

### International Federation of Surveyors

**FIGFédération internationale des géomètresFIG, Federation Internationale des Geometres**

### 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.