SE eh rp eae ee 
0. N. Rood on a Secondary Spectrum. 177 
Actual a seed spectrum due to 8 eas im ns a 
Th 4g Hg? Hy 
Fok f: 13 ay Piet BAU “11-05 12°75 wie 
Secondary spectrum from construction. 
Th HG Na Hg® Hy Ha Li Hg’ Ka 
| 25 [1-25 | 22 | ‘1 [165 | 95 | 3°25 | 4°75 | 
The magnifying power of the observing telescope was about 
12 diameters. 
2d CASE. 
oe from bisulphide of carbon min of 60°. 
Ha Na Th He Hg* Hg 
1 4°6 1 8 | 54 | 68 | 8 | 183 | 154: | 
Spectrum from grating No. 1, 2d order. 
=a pS Th Ha Li Ka 
OB | 084 8%) 06 4IbBs (CaF felted 
Actual secondary spectrum due to the above. 
He Th Na Hg? Ha Li 
Lge BET ot 68 2 
Secondary spectrum from construction. 
Hp Th Na Hg? Ha Li Hg" Ka 
eo ieee 
The magnifying ai of the observing telescope was about 
five ay a half diameters 
3d CASE. 
Spectrum from bisulphide of carbon prism, 60°. 
sh Ue Hg® Hg" 
[101 | 2 | 11-35 | 13°45 | 176 | 28°35 | 33°85 | 
peer eit — No. ed 1st yee 
Hg! Heg® Ka 
| 76 | o78 | 9°5 )10°7 MY 19-95 1 0-85 | 1 
Actual secondary spectrum from the above. 
ie. te. EM Oe ab 
| 10.1 8. fle] 27. oP 
(The same repeated.) 
Na Ha Li 
OY be Same be aftr | 
Secondary specurum from — 
Na Ha Li Th Hg 
| 1:9 664.60 4 et) a8 9 17°77 | F 2005 | 
Am. Jour. iaciions aes Vou. VI, No. 33.—Sept., 1 
