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The Tonal system is a base 16 system of notation (predating hexadecimal), arithmetic, and metrology proposed in 1859 by John W. Nystrom.〔Nystrom, John W. (''Project of a New System of Arithmetic, Weight, Measure and Coins, Proposed to be Called the Tonal System, with Sixteen to the Base'' )〕 In addition to new weights and measures, his proposal included a new calendar with sixteen months, a new system of coinage, and a clock with sixteen major divisions of the day (called tims). Nystrom advocated his system thus: ==Names for the numbers== He proposed names for the digits, calling zero "noll" and counting (from one to sixteen): "An, de, ti, go, su, by, ra, me, ni, ko, hu, vy, la, po, fy, ton." (Therefore ''ton''al system.) Because hexadecimal requires sixteen digits, Nystrom supplemented the existing decimal digits 0 through 8 with his own invented characters. (These can be seen on his clockface at right.) Later, the hexadecimal notation overcame this same obstacle by using the digits 0 through 9 followed by the letters A through F. The numbers 1116 and 1216 would be said "tonan", "tonde", etc. The table below shows Nystrom's names for successive powers of 1016. Thus, the hexadecimal number 1510,0000 would be "mill-susanton-bong". This first hexadecimal system, proposed in the 19th century, has thus far not achieved widespread usage. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tonal system」の詳細全文を読む スポンサード リンク
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