Curve No. 22. III. Still darker rubbing.
Scale.
.Aperture.
Average.
Corrected.
White.
Percent.
Log of
ratio.
10
3 '5 3-2
3-3
_
81-2
4-07
-1-391
15
4-0 - 4-0
4-0
85-4
4-68
-1-329
20
7 '5 8-0
7'8
87-0
9-07
-1-042
25
13-5 13-5
13-5
86-6
15-6
-0 806
30
19-0 18-2 20-0
19-0
83-5
22-8
-0-642
35
23-0 23-2
23-1
77-2
29-9
- -524
40
26-0 28-0 27-0
27-0
69-3
38-9
-0-410
28 -5 26 -5
45
3-1 28 5
29-0
64-4
45-0
-0-346
50
28 -0 28 -0
21-0
57-3
48-8
-0-312
55
21-0 22-0
21-5
54-7
39-3 -0-406
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Curve No. 23. IV. Very heavy rubbing of tbe same ink.
Scale.
Aperture.
Average.
Average
corrected
from curve.
White.
Per cent.
Log of
ratio.
10
1-5 1 '5
1-5
1-5
81-2
1-85
-1-732
15
2-0 2-0
2-0
1-9
85-4
2-12
-1-674
20
2-0 2-0
2-0
2-1
87-0
2-42
-1-616
25
1-5 1-7
1-6
2-2
86-6
2-55
- 1 -594
30
2-5 2-3
2-4
.
83-5
2-88
-1-541
35
3-8 4-0
3-9
77-2
5-06
-1-2U6
40
6-1 6-6 6-2
65
.
69-3
9-37
-1-028
45
8-5 8-8
8-6
64-4
13-35
-0-874
50
8-2 7-5
7'9
57-3
13-77
-0-861
55
6-5 6 -5
6-5
54-7
11-85
-0-926
Ill
IV
Ill
Scale.
I
III
II
m
Katio v .
Katio.
Ratio.
10
15
(1-77)
(1 -00)
20
2-05
1-11
25
2-05
(l-98)
1-15
30
2-24
2-41
1-16
35
2-20
2-42
1 -16
40
2-27
2-51
1-21
45
2-26
2-54
1-23
50
1-95*
2-76*
l-23
55
(2 -61)
2-27
(1-48)
Mean ....
2-16
2-45.
1-18
These two are the only ones which have been corrected from the curve.
