IN PRACTICAL ASTRONOMY, SPECTROSCOPICALLY EXAMINED. 
2. Judson’s Dyes, CAMBRIDGE BLUE. 
833 

Solution of strength = 57;. 


Light begins 
Maximum Rep Licgut 
Ends in dark haze band . > 
End of that haze band darkish . 
MAxIMuM GREEN LIGHT 
End all in violet 
Intensity. 
oF NEF OG SO 
T. 
25°32 
25:60 
25°85 
26°15 
26°64 
28°15 

Solution of strength = 31,. 

Wave-number 
in Brit. Inch. 

Colour Region by 
Wave-number. 

34 892 
38 580 
41 494 
44 563 
49 334 
60 709 
Crimson RED 
SCARLET 
AMBER 
YELLOW 
GREEN 
LAVENDER 
One narrow red band, and one broad blue band. 





Light begins ai 0 25°30 34 626 | Crimson Rep 
Maximum Rep LicHt 2 25:41 36 166 | RED 
Ends . F : : ‘ q : 0 Dine bel. 37 538 | SCARLET 
Light begins again broadly and hazily 0 27:00 52 549 | GLAaucouS 
Maximum BuveE LicHt 2 27°55 56 722 | BLUE 
End all 0 28°08 60 248 | LAVENDER 
Solution of strength = ;4. Shows a faint blue band only. 
Light begins 0 27°33 55 036 | BLUE 
Maximum Licut BLuE 1 27:59 57 013 | InpIGo 
End all | 0 2790 | 59 067 | VioLEr 


3. OXFORD BLUE. 


Solution of strength = 5},. 
green, blue, and violet. 

Solution of strength = 34>. 

Light begins. ° : ° 
Maximum Licut Rep 
Ends : 
Light begins again 
Maximum LIGHT VIOLET 
End all 
VOL, XXVIII. PART III. 

Intensity. 
Sy WS jeyrey fy S&S 

Wave-number 
in Brit. Inch. 
34 758 
37 286 
39 170 
48 567 
53 996 
61 173 

Brightens the red, dulls the yellow broadly, and admits 
Colour Region by 
Wave-number. 
CRIMSON RED 
SCARLET 
ORANGE 
GREEN 
GLAUCOUS 
LAVENDER 
101 
