obviously wrong. Otherwise the actual means were used so that the error might be the more readily estimated. Had I been able to obtain printed uniform patches I have no doubt the results would have been better. But even these can leave no doubt of the approximate truth of the law.
A Blue Ink from Winstone.
Curve No. 20. I. A very faint rubbing.
 | A table should appear at this position in the text. See Help:Table for formatting instructions. |
Scale.
Aperture.
Average.
Corrected
from curve.
White.
Per cent.
Log of
ratio.
10
10 -0 10 -5
10-2
81-2
1
12-4 ! -0-906
15
16-0 - 14-5
15-2
85-4
17'7
-0 -752
20
27-0 - - 27-0
27 -0 87 -0
31-0
-0-508
25
35-5 - 35-0
35 -2 86 -6
40-6
-0-392
30
43 -0 43 -0
43-0
83-5
51-6
-0-288
35 43-0 46-0 45 41 -6
77-2
57-8
-0-238
40 45-0 - - 46-0 i 45-5
69-3
65-7
-0-182
45
50-0 53-0 48-50
50 -0 64 -4
70-0
-0-155
50
38 -0 42 -0 39 '0 39 '6 | 57 '3
69-1
-0 -160
55
38-5 38-0 38-2
54-7
69-7
-0-157
Curve No. 21. II. A little darker than I.
| A table should appear at this position in the text. See Help:Table for formatting instructions. |
Scale.
Aperture.
Average.
Corrected
from curve.
White.
Per cent.
Log of
ratio.
10
4 -5 _ 4-0
4-2
81-2
5-2
-1-384
15
6 -0 6-5
6-7
.
85-4
7-8
-1-107
20
10 -5 9 -5
10-0
87-0
11-5
-0-939
25
18-0 - 16-5
17-2
86-6
20-0
-0-699
30
23-0 - - 24-0
23-5
83-5
28-1
-0-551
35
27 5 26-5 28-0
27-3
77-2
35-5
-0-450
40
32-0 - - 32-0
32-0
69-3
46-0
-0-337
45
33 -0 35 -0 33 '0
33-6
64-4
52-2
-0-282
50
27 -0 28 -0 32 -0
29-0
32
57-3
55-8
-0-254
55
30 -0 29 -5
29-8
54-7
53-4
-0-272
