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| | Stichting Huygens-Fokker: Simon Stevin: On the theory of the art of singing |
 | | These tones being known, all the others are revealed by various methods of operation, for in order to have the ratio of the one-tone-and-half, one may subtract the whole tone from the two-tone-and-half, or the ditone from the three-tone-and-half, or add the whole tone to the semitone, and thus with all others. |
 | | Adding the same ratio makes for the whole tone the ratio 10 000 / 8 908, whereas by the first method we got 10 000 / 8909, the cause of which small difference is evident. |
 | | If one now wants to see how far amiss were the erroneous divisions of Pythagoras, Boëthius, and Zarlino, this is readily possible by putting the largest number of their ratio also 10 000. |
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