Page:A history of Japanese mathematics (IA historyofjapanes00smitiala).pdf/36

24 thousands, and so on for the odd places, were represented as follows: The tens, thousands, hundred thousands, and so on for the thethe [sic] even places, were represented as follows:

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.