"In the second comparison and combination of the three primary ratios, 1/9 is the unit of quantities, and 3 is the unit of motions; and the same primes and the same process as already used in the first comparison and combination will give the same relative quantities; and the motions will be 3, 6, 9, and 15, compared with the original unit." [Scientific Basis and Build of Music, page 16]

See Also

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Distance
first comparison and combination of quantities
first condition in the first ratio
first condition in the third ratio
first condition of the second ratio
Frequency
Law of Relativity of Force
laws of quantities and motions
Motion
Number
order of quantities
Period
quantities and motions
quantities
Ratio
Time
unit of quantities
Unit