Roman abacus
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The Roman hand abacus was one of the earliest known portable calculating devices, used in the Roman world. It was a base-10 form of the abacus, with movable beads held in slots rather than loose count
A reconstruction of a Roman hand abacus, made by the RGZ Museum in Mainz, 1977. The original is bronze and is held by the Bibliothèque nationale de France, in Paris. This example is missing many counter beads.
Velser's reconstruction of Roman abacus (ca. 1600)
Representable fractions of an uncia under each interpretation
Abacus
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An abacus, also called a counting frame, is a hand-operated calculating tool which was used from ancient times, in the ancient Near East, Europe, China, and Russia, until largely replaced by handheld
Roman abacus
…The Roman hand abacus was one of the earliest known portable calculating devices, used in the Roman world. It was a base-10 form of the abacus, with movable beads held in…
An early photograph of the Salamis Tablet.
Use of an abacus, as illustrated in Margarita philosophica (1503)
Russian schoty