138ed22
| ← 137ed22 | 138ed22 | 139ed22 → |
138 equal divisions of the 22nd harmonic (abbreviated 138ed22) is a nonoctave tuning system that divides the interval of 22/1 into 138 equal parts of about 38.8 ¢ each. Each step represents a frequency ratio of 221/138, or the 138th root of 22.