Hartley 
THE SPECTRUM OF AIR. 
2 ". D ORDER. 
Phil.Tra,ns. 1884 .Plate 6 . 
2200 2800 2700 
-T 
Ul'lllll; 
•III 
0 70 GO 50 0-0 30 20 10 
ilillni! iiiilnii Inn Inn uiiliill Inn Imiliiii Inn mil ii ii ini III li 
go 80 70 GO so 
llllllllllllllllllllllllllllllllllllllllllllllll 
40 
III lllll'Mill 
30 20 
nliiiiliiiiliiilliiii 
mil i ii iliinliillliniliiiiliiiiliiiiliiii Iiiii In ill null iiilim Inn Ini ilimliiiiliiiiliiiiliiii hull 
_ 
WcofcNowmut* C? litk. 
