178 
PROFESSOR W. N. HARTLEY OX 
Potassium. 
Potassium chloride. Exposure 25 minutes. Avery strong continuous spectrum 
extends from \ 4610 to 3440, continuing more weakly to 3057, loc. cit., Kaysee and 
Eunge. 
Katser aucl Runge. 
Ivory scale- 
1 
Remarks. 
nurubers. 
\ 
1 
X 
i 21-1 
1714 
1714610 
58.32-23 
S.s. ' 
* 
! 22-.3 
1723 
1723541 
5802-01 
D.s. 
> B ffroup 
22-8 
1729 
1729305 
5782-67 
D.s. 
L. DE B. 
.34-9 
1866 
1865713 
5353'6 
S.s. ^ 
Pleasured also by 
35-4 
1873 
1872631 
5340-08 
S.s. 
^ L. DE B. 
' 96-1.5 
2471 
2470746 
4047-36 
P.s. i 
Measured also by 
96-3 
2473 
2472622 
4044-29 
p.s. J 
L. DE B. 
148-7 
2902 
/2900661\ 
V2901503 ) 
/3447-49\ 
1,3446-49 / 
p.s. 
176-7 
.3110 
31080 
/3217-76\ 
V.3217-27j 
p.s. 
P.s. Principal series. 
D.s. Diffuse series. 
S.s. Sharp series. 
Cadmium. 
Metal and also cadmium sulphate yield the same spectrum, consisting of one line 
only. It is the least refrangible of the triplets at Cd 17. Exposure 30 minutes. 
Scale- 
uumbers. 
Oscillatiou 
frequencies 
from curve. 
Oscillatiou frequencies 
for comjDarison. 
Wave-lengtlis. 
170-9 
30663 
3066384 K. and R. 
3261-17 K. and R. 
K.ATSER and Ruxge. 
Zinc and Zinc Oxide. 
Zinc foil was burnt in the oxy-hydrogen flame during 30 minutes. Nothing but a 
continuous spectrum is visible. Zinc oxide was intensely ignited in the flame for 
60 minutes; it yielded nothing but a continuous spectrum. No lines or bands were 
visible. 
* Measured also by Lecoq de Boisbaudean. 
