Thanks Rob, most interesting.
I later found the following table which Earle Caley drew up to compare various contemporary scales;
Mionnet / Leake / Dickeson / Prime and Head scales.
Can’t recall seeing the other scales mentioned in old catalogues though. They didn’t seem to enjoy quite the same popularity as Mionnet😉
Scale
Number
Mionnet,
1805
Leake, 1854
Dickeson,
1859
Prime,
1861
Head,
1887
1
8.9
I
9.3
9.5
7.5
9.3
2
12.1
II
12.1
12.5
14.0
12.3
3
15.4
III
15.3
15.3
20.1
15.3
4
18.1
IV
18.1
18.3
24.2
17.8
5
21.2
V
21.2
21.3
28.2
21.0
6
23.7
VI
23.8
24.2
32.1
23.9
7
26.6
VII
26.6
26.6
40.4
26.1
8
28.9
VIII
28.8
28.9
43.0
28.4
9
31.8
IX
31.4
31.3
45.7
31.2
10
35.2
X
34.9
33.9
48.3
34.7
11
37.7
XI
37.5
36.5
52.3
37.5
12
40.5
XII
39.7
39.0
55.1
39.7
13
43.4
42.1
57.8
43.2
14
51.8
50.4
60.3
51.0
15
56.7
54.9
62.9
55.9
16
60.6
58.7
65.8
60.1
17
64.5
62.8
68.6
63.2
18
70.9
68.8
71.6
69.8
19
78.3
75.9
74.6
77.0
20
83.1
82.1