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Line.
Scale.
Wave-length.
Old.
New.
D
50-0
39-3
46-8
81-8
30-5
109-0
41-2
73-0
92-8
64-1
64-4
64-5
81-6
56-5
57-5
37-1
56-3
98-3
17-7
7-0
14-5
49-5
1-8
76-7
8-9
40-7
59-5
31-8
32-1
32-2
49-3
24-2
25-2
4-8
24-0
66-3
5889
6708
6102
4603
7680
4045
6563
4860
4340
5183
5172
5167
4607
5535
5492
6933
5543
4226
K, red
H, C
H, F ..
H
Ms. green .
Sr blue
Ba
Ba
Ca
Ca . .
Ca
The D line on the new scale was at 17 '7, and as it was also a milli-
metre scale, the new scale readings will all be 32*3 less than the
previous ones.
To test this the following readings were taken :
| A table should appear at this position in the text. See Help:Table for formatting instructions. |
Stem.
D.
Li, red.
Li, blue.
Mg.
Old scale
50-0
39-3
81-8
64-5
New scale
17'7
7-8*
49-5
32-3
Difference
32-3
31-4
32-3
32-2
17. Determination of the Curves of Practical Inks.
January 1, 1900. We set up the apparatus with the two right-angle prisms and obtained the patches. We found some difficulty due to stray light, which we nearly eliminated, so far as the outside of the apparatus was concerned, by inclosing it with screens. A cloth was placed over the arc and over the collimator and prisms, and a blackened canvas screen was hung up to divide the end of the room where the observations were made from the end containing the light But when matching pigments in a part of the spectrum in which they were nearly black, we were still able to perceive a small difference of colour in the two patches, which was due to internal reflections on the
- Probably an error in reading.
