Abacus

The uppermost part of a colurnn capital or pilaster, on which the architrave rests.

Also, a bead frame used as an arithmetic calculating aid.

A bead abacus used in arithmetic.

Historical Notes

  1. ~3000BC The abacus is developed in the Middle East and in areas around the Mediterranean. A somewhat different type of abacus is used in China.

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Subjects: Civil Engineering Mathematics