1L 2s

	↑ 1L 1s	2L 1s ↗
	1L 2s	2L 2s →
	↓ 1L 3s	2L 3s ↘

┌╥┬┬┐ │║│││ │││││ └┴┴┴┘
Scale structure
Step pattern	Lss ssL
Equave	2/1 (1200.0 ¢)
Period	2/1 (1200.0 ¢)
Generator size
Bright	2\3 to 1\1 (800.0 ¢ to 1200.0 ¢)
Dark	0\1 to 1\3 (0.0 ¢ to 400.0 ¢)
Related MOS scales
Parent	1L 1s
Sister	2L 1s
Daughters	3L 1s, 1L 3s
Neutralized	2L 1s
2-Flought	4L 2s, 1L 5s
Equal tunings
Equalized (L:s = 1:1)	2\3 (800.0 ¢)
Supersoft (L:s = 4:3)	7\10 (840.0 ¢)
Soft (L:s = 3:2)	5\7 (857.1 ¢)
Semisoft (L:s = 5:3)	8\11 (872.7 ¢)
Basic (L:s = 2:1)	3\4 (900.0 ¢)
Semihard (L:s = 5:2)	7\9 (933.3 ¢)
Hard (L:s = 3:1)	4\5 (960.0 ¢)
Superhard (L:s = 4:1)	5\6 (1000.0 ¢)
Collapsed (L:s = 1:0)	1\1 (1200.0 ¢)

1L 2s is a 2/1-equivalent (octave-equivalent) moment of symmetry scale containing 1 large step and 2 small steps, repeating every octave. Generators that produce this scale range from 800 ¢ to 1200 ¢, or from 0 ¢ to 400 ¢. This MOS is the parent of tetric (3L 1s) and antetric (1L 3s), the former being the parent of mosh (3L 4s) and smitonic (4L 3s), and the latter being the predecessor of other MOS scales such as semiquartal (5L 4s), gramitonic (4L 5s), and other 1L ns MOS scales.

Names

TAMNAMS uses the name antrial.

Modes

Scale degrees of the modes of 1L 2s

UDP	Cyclic order	Step pattern	Scale degree (mosdegree)
			0	1	2	3
2|0	1	Lss	Perf.	Aug.	Perf.	Perf.
1|1	3	sLs	Perf.	Perf.	Perf.	Perf.
0|2	2	ssL	Perf.	Perf.	Dim.	Perf.

Intervals

Intervals of 1L 2s

Intervals			Steps subtended	Range in cents
Generic	Specific	Abbrev.
0-mosstep	Perfect 0-mosstep	P0ms	0	0.0 ¢
1-mosstep	Perfect 1-mosstep	P1ms	s	0.0 ¢ to 400.0 ¢
	Augmented 1-mosstep	A1ms	L	400.0 ¢ to 1200.0 ¢
2-mosstep	Diminished 2-mosstep	d2ms	2s	0.0 ¢ to 800.0 ¢
	Perfect 2-mosstep	P2ms	L + s	800.0 ¢ to 1200.0 ¢
3-mosstep	Perfect 3-mosstep	P3ms	L + 2s	1200.0 ¢