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24
III. The Development of the Soroban.
thousands, and so on for the odd places, were represented as follows:
| I | II | III | IIII | IIIII | I | II | III | IIII |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
The tens, thousands, hundred thousands, and so on for the the even places, were represented as follows:
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These numerals were arranged in a series of squares resembling our chess-board, called a swan-pan, although not at all like the Chinese abacus that bears this name. The following illustration (Fig. 6), taken from Satō Shigeharu's Tengen Shinan of 1698, shows its general form:
Fig. 6. The general form of the sangi board, from a work of 1698.
