A 26 tone well tempered nonet (26WTN) is related to well temperaments of 22edo and 23edo, but with a nonet rather than the 2/1 being constant. Its patent tunings alternate division of the just perfect fifth into 13 equal parts (13EDF) with sequences of thirteen equal steps of 46.15385 to 61.5385 cents each. This will create thirteen equally-spaced intervals between an interval between 600 and 800 cents and the just perfect fifth.

Optimal Intervals

Minimum a Maximum a Minimum b Maximum b
1 53.9965
2 107.9931
3 161.9896
4 215.9862
5 269.9827
6 323.9792
7 377.9758
8 431.9723
9 485.9688
10 539.9654
11 593.9619
12 647.9585
13 701.9550
14 755.2883 759.0979 749.955 753.3836
15 808.6117 816.2407 797.955 804.8121
16 861.955 873.3836 845.955 856.2407
17 915.2883 930.5264 893.955 907.6693
18 968.6117 987.6693 941.955 959.0979
19 1021.955 1044.8121 989.955 1010.5264
20 1075.2883 1101.955 1037.955 1061.955
21 1128.6117 1159.0979 1085.955 1113.3836
22 1181.955 1216.2407 1133.995 1164.8121
23 1235.2883 1273.3836 1181.955 1216.2407
24 1288.6117 1330.5264 1229.995 1267.6693
25 1341.955 1387.6693 1277.995 1319.0979
26 1395.2883 1444.8121 1325.995 1370.5264