Palm (unit)
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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
Detail of the cubit rod in the Museo Egizio of Turin, showing digit, palm, hand and fist lengths
Sign giving the metric equivalents of the units in use in the 17th century in the covered market of Pernes-les-Fontaines in the Vaucluse
Inch
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The inch is a unit of length in the British Imperial and the United States customary systems of measurement. It is equal to 1/36 yard or 1/12 of a foot. Derived from the Roman uncia, the word inch is
Palm (unit)
…notional value of 7.4 cm (2.9 in) within a range of a few millimeters. The palm was divided into four digits (digitus) of about 1.85 cm (0.7 in) or three inches (uncia) of about 2.47 cm (1.0 in). Three made a span (palmus maior or "greater palm") of about 22.2 cm (9 in); four, a Roman foot; five, a hand-and-a-foot…
A measuring tape with inches
A fire hydrant marked as 3-inch
Mid-19th-century tool for converting between different standards of the inch
Set of gauge blocks from 1919