IN PRACTICAL ASTRONOMY, SPECTROSCOPICALLY EXAMINED, 
3. Judson’s Dyes—LA VEN DER—continued. 
839, 
Solution of strength = zjp: is eminent as a duller of yellow, orange, red and citron. 
Light begins 
Faint Maximum Rep Licut “ 
Red light ends in a dark band . : 
Green light begins after a dark band . 
Faint Green Maximum . 
Green ends, blue begins 
End all 
O 



Wave-number | Colour Region by 


Intensity. r. in Brit. inch. 
0 25°43 36 456 
Fe 25°68 39 526 
1 25:97 42 790 
1 26°33 46 382 
2 26°67 | 49 579 
a 27-15 53 763 
0 28:03 59 923 
Wave-number. 
RED 
ORANGE 
AMBER 
CITRON 
GREEN 
| GLAUCOUS 
VIOLET 

Solution of strength = 525, excludes all light except a ghost of vioLET band. 
4, Judson’s Dyes—PURPLE. 
A rich, we. a lakey, blue. 
An intense colour. 

Solution of 5355 strength. Extinguishes yellow completely, citron almost, 
brightens the red, and the blue and violet. 
Intensity. 

Light begins 
Maximum Rep Licut 
Ends in a smoky band 
End of that band 
Maximum Green light 
Maximum Blue 
End all 
Light 
COWWRHeH ao oO 

25°35 
25°75 
25°92 
26°16 
26°75 
27°39 
28°26 
Wave-number 
in Brit. inch. 
35. 298 
40 388 
42 265 
44 643 
50 276 
55 525 
61 451 

Colour Region by 
Wave-number. © 
RED 
AMBER 
AMBER 
YELLOW 
GLAUCOUS 
BLUE 
LAVENDER 
Solution= 45 strength. Shows one strong red band and one strong blue one. 

Light begins 
. 
Maximum Rep Licut 
Ends 
Begins again in green blue 
Maximum Buve Licut 
End all 

ow CO FF SO 
25°33 
25°63 
25°81 
26°97 
27:58 
28°38 
35 026 
38 941 
41 034 
52 274 
56 948 
62 251 
RED 
SCARLET 
AMBER 
GLAUCOUS 
BLUE 
LAVENDER 

