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Diagram explaining the Greek Scale arranged into Tones and Semitones [Hemitones] with Greek note names on the right-hand side
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Voltaire illustrated Newton's conception of a shared mathematical basis for music's seven-note diatonic scale and the seven colours of the spectrum in this 'Table des couleurs & des tons de la Musique'
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Newton's colour wheel, illustrating the relationship between diatonic note intervals and colours as shown in his Opticks. Each segment relates to one of the seven diatonic intervals
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A monochord: This is a musical instrument for measuring relationships between musical intervals. Since antiquity monochords have been used to demonstrate the mathematical principles underlying music. In this illustration from Robert Fludd's Utriusque cosmin, a monochord is mathematically divided to achieve a two-octave scale. Interval names indicated in Greek and Latin. Click to see enlarged image.
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