Palm (unit) - The Continental Palm, The Length of The Hand

The Continental Palm, The Length of The Hand

In various parts of Europe and the Mediterranean, the palm was based on the length of the hand rather than the width. Greaves in 1647 gives equivalents for three kinds of palm, the Roman palmo di Architetti or architect's palm, the Roman palmo del braccio di mercantia or commercial palm, and the Genoa palm. In 1795 (and again in 1815) these values were reported by Charles Hutton:

Length of a palm in Mediterranean cities after Hutton
City Inches Metric equivalent
Rome 87⁄24 211 mm
Naples, as reported by Riccioli 8 203 mm
Naples, as reported by others 87⁄12 218 mm
Genoa 93⁄4 248 mm
Morocco and Fez 71⁄6 182 mm
Languedoc and some other parts of France 93⁄4 248 mm
Metric equivalents are approximate, and do not take account of possible regional variations in the inch

Palaiseau, writing in 1816, gives these metric equivalents for the palme or palmo:

Length of a palm in European cities after Palaiseau
City Lignes Metric equivalent
Florence (for silk, p.146) 131.63 mm
Florence (for wool, p.146) 128.38 289.6 mm
Genoa (cloth measure, p.148) 106.9 241.1 mm
Genoa (linear measure, p.91) 107.43 242.3 mm
Livorno (for silk, p.157) 128.41 289.7 mm
Livorno (for wool, p.157) 130.08 293.4 mm
Malta (cloth measure, p.160) 114.49 258.3 mm
Malta (linear measure, p.98) 115.28 260.0 mm
Palermo (cloth measure, p.168) 107.16 241.7 mm
Portugal (p.109) 96.36 217.4 mm
Rome (cloth measure, p.173) 109.52 247.1 mm
Rome (linear measure, p.111) 99 mm
Metric equivalents in the source here rounded to 0.1 mm

According to a sign displayed in Pernes-les-Fontaines, Vaucluse, France, a palme or palm of 246.1 mm was in use there in the 17th century, and was one eighth of a canne. The same proportion applied in Malta, at Rome and at Palermo.

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