90 L. Schwendler—On a new Standard of Light. [No. 2, 
r= 
Be Jel beh oF 
A iS} 
Oo S fy 
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EB 1, III q Z Os 
& | producing | producing x S Ay Remarks and particulars. 
a é 5 
= d' mm dmm OS = 
S from Prism. from Prism. 5 
a QA 
6 103 147 21.0 Current increased by decreasing the: 
101 149 21.0 resistance of the Mercury Rheostat,, but 
101 149 21:0 kept constant at 21°. 
101 149 21.0 Clear glass again on both like experi-- 
101 149 21.0 ment No. 1. 
101 149 
6 101.3 148.7 | 21.0} 0.46 
vf 104 146 21 Clear glass cover on No. III, 
103 147 21 No glass cover on No. II. 
102 148 21 . 
102 148 21 
102 148 21 
21 
7 102.6 147.4 21 0.48 
8 101 149 21 Clear glass cover on No. II, 
100 150 21 No glass cover on No. III, 
100 150 21 
99 151 21 
100 150 
100 150 
100 150 
8 100 150 21 0.44 
9 101 149 21 Both the clear glass covers on, 
101 149 21 , 
101 149 21 
9 101 149 21 0.46 
The Deflection 18.8° represents a current = 7.82 webers. 
The Deflection 21.0 represents a current = 8.81 webers. 
From these results the following conclusions can be drawn :— 
The thin glass covers, as was to be expected, absorb a measurable 
quantity of light. Compare the results of experiments Nos. 1, 2 and 3, 
and of 6, 7, 8 and 9. 
Covering the glass covers inside with black paper to avoid back- 
