Abacus. Hands carrying out a calculation using an abacus. An abacus is an early form of arithmetic calculator. Its name is derived from a method of counting using stones on a 'flat surface' (an abacus in Latin) that was familiar to the ancient Greeks and Romans. The modern abacus consists of beads on a frame. Experienced users may perform calculations faster than by using an electronic calculator,but the technique needs practice | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Burriel, Oscar |
Bildgröße: | 3534 px × 3475 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
|