IN PRACTICAL ASTRONOMY, SPECTROSCOPICALLY EXAMINED. 
817 





Solution = 35457, pale pink in colour, when seen through 1 inch thickness 
by broad daylight. 









: Wave-number | Colour Region by 
Intensity. ve n Brit. inch. | Wave-number. 
First reddish black light 0 25°33 35 026 RED 
Decided red light 1 Zier ji au uLeo SCARLET 
Maximum LicHTt in ORANGE 8 25°84 41 374 | AMBER 
Ends in hazy edged dark band . L 26:07 43 802 | YELLOW 
’ Centre of said dark band 0 26:15 44 563 YELLOW 
That band ends in a fainter elede 2 26°21 45 147 CITRON 
Another dark band begins . 1 26:27 45 '746 CITRON 
Centre of said dark band 0 26°35 46 598 CITRON 
That band ends in a rather less danke anes 1 26°40 AT 192 GREEN 
Another dark band begins. if 26°50 48 146 | GREEN 
Centre of said dark gray band 0 26°58 48 828 | GREEN 
That band ends in a fainter shade 1. 26°63 49 237 GREEN 
Another darkish band begins i 26°72 50 025 | Giaucous 
Said greenish gray band ends 2 26°84 51 099 | GLAucoUS 
A very faint dark greenish band begins 2 26°93 51 894 | GLAucoUS 
Said band ends . ' , ; oi 27:06 53 079 GLAUCOUS 
Centre of a still fainter and more hazy band 3 27:18 53996 | GLAUCOUS 
Maximum VIoLeT LIGHT 5 2757 56 883 | BLUE 
End of all light 0 28°18 60 909 | LAVENDER 

Solution = +5457, 1 inch thickness appears a bluish pink by daylight. 




er Ist Obser. | 2d Obser. | Mean W.L. | Colour Region. 
Red shade begins . ; ei Eel 25:34 25°33 25°34 | 35 162 | Rep 
Maximum LIGHT, ORANGE 6 | 25:87 25°82 25°84 | 41 374 | AMBER 
Hazy beginning of absolute black] 0 | 26:06 26°06 26:06 | 43 687 | YELLow 
Broad black band ends a Oy 2006 27°08 27:07 | 53 135 | Glaucous 
Greenish lighter shade ends .| 2]| 27:26 27:27 27-26 | 54 555 | Glaucous 
Maximum VIoLeT LicHT . 4| 2763 27°67 2765 | 57 504 | INDIGO 
Ends broadly and obscurely 0] 28:43 28°14 28:28 | 61 595 | LAVENDER 
VOL, XXVIII. PART III. 10 E 
