The palm is an obsolete anthropic unit of length, originally based on the width of the human palm and then variously standardized. The same name is also used for a second, rather larger unit based on the length of the human hand..

The width of the palm was a traditional unit in Ancient Egypt, Israel, Greece, and Rome and in medieval England, where it was also known as the hand,. handbreadth, or handsbreadth..

The length of the hand—originally the Roman "greater palm"—formed the palm of medieval Italy and France. In Spanish customary units or was the palm, while was the span, the distance between an outstretched thumb and little finger. In Portuguese or was the span.

History Ancient Egypt

The Ancient Egyptian palm () has been reconstructed as about . The unit is attested as early as the reign of Djer, third pharaoh of the First Dynasty,. and appears on many surviving cubit-rods.

The palm was subdivided into four digits () of about .

Three palms made up the span () or lesser span () of about . Four palms made up the foot () of about . Five made up the of about . Six made up the "Greek cubit" () of about . Seven made up the "royal cubit" () of about . Eight made up the pole () of about .

Ancient Israel

The palm was not a major unit in ancient Mesopotamia but appeared in ancient Israel as the , , or (, ."a spread").. Scholars were long uncertain as to whether this was reckoned using the Egyptian or Babylonian cubit,. but now believe it to have approximated the Egyptian "Greek cubit", giving a value for the palm of about ..

As in Egypt, the palm was divided into four digits ( or ) of about and three palms made up a span () of about . Six made up the Hebrew cubit ( or ) of about , although the cubits mentioned in Ezekiel, . follow the royal cubit in consisting of seven palms comprising about .

Ancient Greece

The Ancient Greek palm (, palaistḗ, , dō̂ron, or , daktylodókhmē) made up ¼ of the Greek foot (poûs), which varied by region between .. This gives values for the palm between , with the Attic palm around ..

These various palms were divided into four digits (dáktylos) or two "middle phalanges" (kóndylos). Two palms made a half-foot (hēmipódion or dikhás); three, a span (spithamḗ); four, a foot (poûs); five, a short cubit (pygōn);. and six, a cubit (pē̂khys).

The Greeks also had a less common "greater palm" of five digits.

Ancient Rome

The Roman palm () or lesser palm () made up ¼ of the Roman foot (), which varied in practice between . but is thought to have been officially . This would have given the palm a notional value of within a range of a few millimeters.

The palm was divided into four digits () of about or three inches () of about . Three made a span ( or "greater palm") of about ; four, a Roman foot; five, a hand-and-a-foot () of about ; six, a cubit () of about .

Continental Europe

The palms of medieval (). and early modern Europe—the Italian, Spanish, and Portuguese and French —were based upon the Roman "greater palm", reckoned as a hand's span or length.

In Italy, the palm () varied regionally. The Genovese palm was about ; in the Papal States, the Roman palm about according to Hutton but divided into the Roman "architect's palm" () of about and "merchant's palm" () of about according to Greaves; and the Neapolitan palm reported as by Riccioli but by Hutton's other sources. On Sicily and Malta, it was .

In France, the palm ( or ) was about in Pernes-les-Fontaines, Vaucluse, and about in Languedoc.

Palaiseau gave metric equivalents for the palme or palmo in 1816, and Rose provided English equivalents in 1900:

+ Length of a palm in European cities City Lignes Metric equivalent Inches Florence (for silk, Palaiseau p.146) 131.63 mm Florence (for wool, Palaiseau p.146) 128.38 289.6 mm Genoa (cloth measure, Palaiseau p.148) 106.9 241.1 mm Genoa (linear measure, Palaiseau p.91) 107.43 242.3 mm Genoa (Rose) 247 mm 9.72 Livorno (for silk, Palaiseau p.157) 128.41 289.7 mm Livorno (for wool, Palaiseau p.157) 130.08 293.4 mm Malta (cloth measure, Palaiseau p.160) 114.49 258.3 mm Malta (linear measure, Palaiseau p.98) 115.28 260.0 mm Naples (Rose) 263.6 mm 10.38 Palermo (cloth measure, Palaiseau p.168) 107.16 241.7 mm 9.53 Portugal (Palaiseau p.109) 96.36 217.4 mm 8.64 Rome (cloth measure, Palaiseau p.173) 109.52 247.1 mm Rome (linear measure, Palaiseau p.111) 99 mm Sardinia (Rose) 248 mm 9.78 Spain (Rose) 219 mm 8.64 Metric equivalents from Palaiseau here rounded to 0.1 mm From 19th C. Italian sourcesAntonio Pasquale Favaro. Metrologia o sia Trattato Generale delle Misure, de' Pesi e delle Monete - (in Italian) - [Metrology or General Treatise on Measures, Weights and Coins] - Gabinetto Bibliografico e Tipografico (Napoli 1826)Carlo Afan de Rivera. Tavole di riduzione de' Pesi e delle misure della Sicilia Citeriore in quelli statuiti dalla legge de' 6 aprile del 1840 - (in Italian) - [Tables of Reductions of Weights and Measures of Sicilia Citeriore in those established by the Law of 6 April 1840] - Stamperia e Cartiere del Fibreno (Napoli 1840)Angelo Martini. Manuale di metrologia ossia Misure, Pesi e Monete in uso attualmente e anticamente presso tutti i popoli antichi - (in Italian) - [Handbook of Metrology i.e. Measures, Weights and Coins in Current and Ancient Use by All Ancient Peoples] - Editrice E.C.A. (Roma 1976), facsimile reprint of the original Turin edition of 1883 emerges that :

- the ancient Venetian palm, five of which made a passo (pace), was equivalent to 0.3774 metres.

- the Neapolitan palm = 0.26333670 metres (from 1480 to 1840)

- the Neapolitan palm = 0.26455026455 metres (according to the law of 6 April 1840)

which differs from previously cited palm measure equivalents in metres above.

England

The English palm, handbreadth, or handsbreadth is three inches (7.62cm) or, equivalently, four digits. The measurement was, however, not always well distinguished from the hand or handful, which became equal to four inches by a 1541 statute of Henry VIII. The palm was excluded from the British Weights and Measures Act 1824 that established the imperial system and is not a standard US customary unit.

Elsewhere The Moroccan palm is given by Hutton as about .

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References