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Article: Shruti Lattice Diagram & Shruti Ratios
MODERN INDIAN GAMUT
Here is the lattice diagram for the full 22shruti scale, as it is normally
"rationalized" today:
Explanation of the Lattice Diagram:
Moving one step to the "east" means multiplying by 3:2, or the equivalent,
dividing by 4:3.
Moving one step to the "northeast" means multiplying by 5:4, or the
equivalent, dividing by 8:5.
Moving one step to the "northwest" means multiplying by 5:3, or the
equivalent, dividing by 6:5.
All these relationships are easy to tune by ear (as _harmonic_ intervals),
hence the direct connections shown in the lattice.
C  1/1
Db low  256/243 (though 135/128 is 2 cents away)
D low  10/9
Eb low  32/27
E low  5/4
F low  4/3
F# low  45/32
G  3/2
Ab low  128/81
A low  5/3
Bb low  16/9
B low  15/8
C  2/1
You'll find some variations in various works on the subject.
 
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