18L 9s

↖ 17L 8s ↑ 18L 8s 19L 8s ↗

← 17L 9s 18L 9s 19L 9s →

↙ 17L 10s ↓ 18L 10s 19L 10s ↘
	Scale structure
Step pattern	LLsLLsLLsLLsLLsLLsLLsLLsLLs; sLLsLLsLLsLLsLLsLLsLLsLLsLL
Equave	2/1 (1200.0 ¢)
Period	1\9 (133.3 ¢)
	Generator size
Bright	1\27 to 1\18 (44.4 ¢ to 66.7 ¢)
Dark	1\18 to 2\27 (66.7 ¢ to 88.9 ¢)
	TAMNAMS information
Related to	9L 9s
With tunings	1:1 to 2:1 (soft-of-basic)
	Related MOS scales
Parent	9L 9s
Sister	9L 18s
Daughters	27L 18s, 18L 27s
Neutralized	9L 18s
2-Flought	45L 9s, 18L 36s
	Equal tunings
Equalized (L:s = 1:1)	1\27 (44.4 ¢)
Supersoft (L:s = 4:3)	4\99 (48.5 ¢)
Soft (L:s = 3:2)	3\72 (50.0 ¢)
Semisoft (L:s = 5:3)	5\117 (51.3 ¢)
Basic (L:s = 2:1)	2\45 (53.3 ¢)
Semihard (L:s = 5:2)	5\108 (55.6 ¢)
Hard (L:s = 3:1)	3\63 (57.1 ¢)
Superhard (L:s = 4:1)	4\81 (59.3 ¢)
Collapsed (L:s = 1:0)	1\18 (66.7 ¢)
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18L 9s is a 2/1-equivalent (octave-equivalent) moment of symmetry scale containing 18 large steps and 9 small steps, with a period of 2 large steps and 1 small step that repeats every 133.3 ¢, or 9 times every octave. 18L 9s is a child scale of 9L 9s, expanding it by 9 tones. Generators that produce this scale range from 44.4 ¢ to 66.7 ¢, or from 66.7 ¢ to 88.9 ¢. Scales of the true MOS form, where every period is the same, are proper because there is only one small step per period. Its generator is not less than a "pure" diesis or "neutral" quartertone of 1/27edo (44.444 cents) nor greater than a chromatic semitone of 1/18edo (66.667 cents).

1/18						66.667
					6/117	61.5385
				5/99		60.606
			4/81			59.259
				7/144		58.333
						57.513
		3/63				57.143
						56.309
				8/171		56.14
						55.976
			5/108			55.556
				7/153		55.098
					9/198	54.5455
	2/45					53.333
					9/207	52.174
				7/162		51.852
						51.733
			5/117			51.282
						50.929
				8/189		50.794
						50.57
		3/72				50
				7/171		49.123
			4/99			48.121
				5/126		47.619
					6/153	47.058
1/27						44.444