|
|||||||||||||
  |
 altobeads hypobeads |
The abacus (as shown in figure 1)
consists of a rectangular wooden frame which is divided lengthwise into two unequal parts by a horizontal beam or bar. The beads above the beam are called altobeads, and those below it hypobeads. One altobead is equivalent to five hypobeads. |
|||||||||||
| Figure 1 |
