PHYSICS: J. T. HOWELL 
529 
violet glass, spectroscope which gave a dispersion of 1 mm. = 18 A. U. 
at Hy, and 1 mm. = 12 A. U. at the H and K lines. 
Lithium and calcium were examined, both for the longitudinal and 
transverse effects, and the results are given below in tables I and II. 
With both elements the spectra were obtained by covering the cathode 
with a thin layer of the chloride, which gave the characteristic spectrum 
of the metal under the bombardment of the anode rays. The tubes 
were filled with hydrogen, and the field strength was determined for 
every plate by measuring the separation of the outer components of Hy 
and comparing it with Stark's results. The field strength was about 
25,000 volts per cm. close to the cathode. In the following tables the 
numbers marked + indicate components to the red, — to the violet. 
TABLE I 
Lithium. 
Transverse effect for ZOfiOO volts per centimeter 
X IN A 
COMPONENTS POLAR 
PARALLEL 
INT. 
COMPONENT POLAR 
PERPENDICULAR 
INT. 
REMARKS 
4602.37 
4132.93 
+ 1.00 
-2.48 
+2.26 
-0.18 
-3.10 
8 
6 
2 
5 
1 
+0.48 
-2.00 
+ 1.78 
-0.18 
-2.24 
8 
6 
2 
5 
1 
Unpolarized 
Longitudinal efectfor 20,000 volts per centimeter 
4602.37 
4132.93 
+0.57 
-2.01 
+ 1.16 
-0.26 
-1.99 
8 
6 
1 
5 
0 
+0.34 
-1.53 
+0.77 
-0.26 
-1.50 
6 
3 
1 
5 
0 
Unpolarized 
TABLE II 
Calcium H and K 
Transverse effect for 20,000 volts per centimeter 
X IN A 
COMPONENTS POLAR 
INT. 
COMPONENTS POLAR 
INT. 
REMARKS 
PARALLEL 
PERPENDICULAR 
3968.63 
+ 0.22 
6 
+0.16 
6 
Unpolarized 
-0.86 
2 
-0.74 
2 
3933.83 
+0.22 
9 
+0.22 
9 
Unpolarized 
-0.92 
3 
-0.74 
3 
Longitudinal effect for 20,000 volts per centimeter 
3968.63 
+1.27 
3 
+ 1.23 
3 
Unpolarized 
+0.01 
8 
-0.02 
8 
Unpolarized 
-1.17 
0 
-1.11 
0 
Unpolarized 
+ 1.42 
4 
+ 1.38 
4 
Unpolarized 
+0.06 
9 
-0.02 
9 
Unpolarized 
-1.30 
1 
-1.26 
1 
Unpolarized 
