Ramsay
Three times three are nine this would give nine notes; but as the top of the first chord serves for the root of the second one, and the top of the second for the root of the third, in this way these three chords of three notes each are formed from seven different notes. [Scientific Basis and Build of Music, page 96]

See Also

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generative root of the major
root
root of the chord
root of the dominant
root of the major dominant
root of the major subdominant
root of the major subdominant F
root of the minor subdominant
root of the Subdominant
root of the subdominant chord
root of the subdominant minor
root of the Tonic