SIR J. CONROY ON THE AMOUNT OP LIGHT REFLECTED 
254 
Crown Glass. 24’3 mm. plate, a; = 8 mm. 
A. 
Eeadings. 
Half 
difierences. 
a — X. 
b. 
Percentage of 
light transmitted. 
Percentage of 
light transmitted. 
Mean of A and B. 
cm. 
96-6-II07 
96-4-I09-9 
96-2-I09-8 
cm. 
7-0 
G7 
6-8 
194-2 
194-5 
194-4 
209-0 
208-7 
208-8 
86-34 
86-86 
86-68 
86-63 
B. 
94T-I06-7 
6-3 
194-9 
208-3 
87-55 
94‘0-I06R 
GT 
I95-I 
208-1 
87-90 
94'4-I07-0 
G-3 
194-9 
208‘3 
87-55 
87-70 
87-16 
Flint Glass. 7 mm. plate, x = S mm. 
A. 
> 
Eeadings. 
Half 
differences. 
Cl — O’, 
b. 
Percentage of 
light transmitted. 
Percentage of 
light transmitted. 
Mean of A and B. 
cm. 
cm. 
95-8-108-4 
6'3 
195-4 
208-3 
88-00 
96-2-108-1 
6-0 
195-7 
208-0 
88-52 
96-1-107-1 
5-5 
196-2 
207-5 
89-40 
96-5-108-1 
5-8 
195-9 
207-8 
88-87 
88-70 
B. 
93-5-105-0 
5-7 
196-0 
207-7 
89-05 
94-0-105-4 
5-7 
196-0 
207-7 
89-05 
94-2-105-5 
5-7 
I960 
207-7 
89-05 
94-3-106-1 
5-9 
195-8 
207-9 
88-70 
88-94 
88-83 
