IN PRACTICAL ASTRONOMY, SPECTROSCOPICALLY EXAMINED. 
YELLOW-BROWN GLASS—continued. 
809 

FOUR YELLOW-BROWN GLASSES INTERCEPT. 




First red light 
Strong red light 
Very strong red light 
Green begins 
Green black 





Intensity, ip Wave-number | Colour Region by 
Max. =10. ; in Brit. inch. Wave-number. 
01 25:080 30 220 Crimson RED 
0°6 25°200 30 248 Red 
2:0 25°330 | 387 313 | SCARLET 
Red up to this, the Maximum Licut . 47 25760 | 42 105 | AmBrr 
39 25°900 43 '764 YELLOW 
16 26100 | 45 767 | Crrron 
0:0 26:280 47 461 GREEN 
End of all light 

Eigkt yellow-brown glasses transmit a barely visible red band, with maximum light still 
further towards the red end, or at 40,000 Wave N’. 
Hence this sort of glass transmits fairly its own band, which is on the C side of D; but it 
is a broader band, and fainter than the red band near C transmitted by ruby-red glass. 
GREEN GLASS. 

COAL-GAS FLAME’S CONTINUOUS SPECTRUM (REPEATED). 


False glare from internal reflections 
True but faint black-red light 
Strong red light seen at 
D slit, red side thereof 
yellow side 
»? 
Maximum LIGHT 
Green light ends, blue begins at 
Blue light ends, violet light begins 
All light ends at 
Faint gray false glare 
Strong gray g olare : 
First black-red true light . 
Strong black-red light 
Red brown light 
Maximum Licut, grayish in colour 
Grass green light 
Blue shade ' 
Blue black and faint violet 
End of all light . 












Intensity, Wave-number | Colour Region by 
Max. =10. s in Brit. inch. Wave-number. 
0:5 24642 26 596 Ultra Rrep 
0:3 24-965 30 864 Crimson RED 
3°0 25°145 34 305 Crimson Red 
9-0 25°823 | 42 827 | AMBER 
9°3 25°873 43 384 YELLOW 
9:5 25940 | 44 053 YELLOW 
9:0 26:220 46 948 CITRON 
30 26°670 58 140 VIOLET 
0:0 28°430 64 516 LAVENDER 
ONE GREEN GLASS INTERCEPTS. 
0-1 25:100 33 557 | Crimson RED 
0:3 25°300 36 900 RED 
0:5 25°530 39 841 ORANGE 
1°6 25°620 40 650 AMBER 
4°3 DART (O)5) 42 105 AMBER 
72 25960 | 44 444 | YreLLow 
6:0 26°350 48 054 GREEN 
4-4 26°620 50 378 Glaucous 
0:8 27°320 55 463 BLUE 
0:0 27-950 60 496 LAVENDER 
| 
10 c 
VOL. XXVIII. PART III. 
