824 PROFESSOR PIAZZI SMYTH ON COLOUR, 
8. Judson’s RUBY—continued. 
Solution= 535 strength. Shows one bright red-orange band, and one do. violet band. 
Wave-number | Colour Region by 
Intensity. ts in Brit. inch. | Wave-number. 
_————— 
: Zoio2 34 892 | Crimson RED 
Maximum, Orange Light . 25°80 40 933 | AmBER 
Light begins 0 
5 6 
Ends in black . , : ; : 3 0 26°12 44 267 | YELLOW 
: 0 
2 
0 
Begins again 27°58 56 948 | BLuE 
2787 58 893 | VIOLET 
28°31 61 805 | LAVENDER 
Maximum, Violet 
End all 


Solution=, strength. Shows one red band only. 

Light begins . : ; : ‘ ‘ 0 25°28 34 364 | Crimson Rep 
Maximum Light. : 5 : : 4 25°68 39 526 | ORANGE 
Ends. : ; : : : 0 25°95 42 571 | AMBER 


9. Judson’s CLARET-RED. 
Very like the above Ruspy-ReEp. 
10. Judson’s PONCEAU, or POPPY-RED. 
Also very like the above Rusy-ReEp, but with the red band rather more to the red, 
and the blue band fainter. 
11. Judson’s MAUVE-RED. 
A strong colourer. 
COAL-GAS LUMINOUS FLAME, as foundation. 


Wave-number | Colour Region by 


Intensity. ae in Brit. Inch. | Wave-number. 
False red glare . : : : 3 : 0 24°86 29 087 | Ultra RED 
First true red light . é : : ; 1 25°18 33 102 | Crimson RED 
Slit, by sodium light, 1st side. 4 : ita 26:01 43 015 | Yellow 
_ 2dside . ; r 11 26:03 43 203 | Yellow 
Maximum Licut, YELLow . ; : ‘ 12 26:03 43 403 | Yellow 

End of all light at violet . : : ‘ 0 28°46 62 712 |LavenderGray | — 


