Ell
From Wikipedia, the free encyclopedia
For other uses, see Ell (disambiguation).
| International units | |
|---|---|
| 1.143 m | 1.143×10−3 km |
| 1143 mm | 11.43×109 Å |
| 7.64×10−12 AU | 120.815×10−18 ly |
| US customary / Imperial units | |
| 45 in | 3.75 ft |
| 1.25 yd | 710.227×10−6 mi |
An ell (from Proto-Indo-European *el- "elbow, forearm), when used as a unit of length, is usually 45 inches, i.e. 1.143 m (for the international inch). It is now obsolete and was mainly used in the tailoring business. It was derived from the length of the arm from the shoulder (or the elbow) to the wrist, although the exact length was never defined in English law.
Several different national forms existed, with different lengths, including the Scottish ell (approximately 37 inches), the Flemish ell (approximately 27 inches) and the Polish ell (0.78 metres).
This unit has mostly fallen out of use, as have others based on the human arm:
- digit (1/60 ell),
- finger (7/360 ell),
- palm (1/15 ell)
- hand (4/45 ell),
- shaftment (2/15 ell),
- span (1/5 ell)
- cubit (2/5 ell).
Sometimes ‘ell’ is used as an alias for the cubit.
