(r6ie9 
APPENDIX II. 
COLOURED-FLUID SERIES OF ABSORPTION SPECTRA, 
Observed with PRISM 2; Disprrsion=1°2, from A to H, Solar. 
Magnifying power of inspecting telescope = 10. 
(In Five Divisions :) 
DIVISION I., RED MEDIA; DIV. II., YELLOW MEDIA ; DIV. III., GREEN MEDIA; DIV. IV., BLUE MEDIA: 
DIV. V., VIOLET MEDIA. 

DIVISION I—RED MEDIA. 
1. PERMANGANATE OF POTASH; or POTASSIC 
PERMANGANATE. 
Watery Solutions thereof; ;755 to ss}y7 (its colouring power being most intense), in flat 
glass bottles presenting films of 5 inches area, and 1 inch thick. 




COAL-GAS LUMINOUS FLAME’S CONTINUOUS SPECTRUM, 
as foundation for what follows. 
With all this series of observations, the slit was used much narrower than with the coloured 
glass series; to the degree shown by the readings below for the breadth of the sodium 
line, and graphically exhibited in the Plates. 



Intensity, ' ; 
Ord, Max r. |in Beit inch, | ‘Wares 
False red glare . : : : : 0 24°86 29 087 | Ultra Red 
First true red light, . é ; : : 1 25°18 33 102 | Crimson Red 
Shit, by sodium light, 1st side, . : ; i 26:01 43 015 | YELLOW 
3 vi 2d side, . F ; id 26:03 43 203 YELLOW 
Maximum Licut, YELLow . : : : 12 26:03 43 403 | YELLOW 
End of all light at violet . é : ; 0 28°46 62 712 | Lavender 


