MESSRS. J. MILNE AND T. GRAY ON SEISMIC EXPERIMENTS. 
867 
III., IV., and Y.—Falls of ball on the line A D. Ball fell 31 feet. 
Number of experiment. 
Number of 
bottle. 
Observer. 
Station. 
III. 
IV. 
V. 
Time of 
Time of 
Time of 
motion. 
motion. 
motion. 
feet. 
seconds. 
seconds. 
seconds. 
6 and 3 
Milne . . 
100 
20 
21 
22 
4 and 5 
Kinch . . 
200 
20 
22 
. # 
4 and 5 
Kinch . . 
270 
Not observed 
Not observed 
20 
YI. —Fall of ball on the line A B. Ball fell 31 feet. 
Number of 
bottle. 
Observer. 
Station. 
Time of motion. 
feet. 
seconds. 
6 and 3 
Milne . . 
100 
30 
4 and 5 
Kinch . . 
400 
13 and 15 
VII. and VIII. — Fall of ball on the line A B. Ball fell 31 feet. 
In these experiments the floats were taken out of the bottles and the movement of 
the surface of the mercury observed directly. 
Number of experiments. 
Number of 
bottle. 
Observer. 
Station. 
VII. 
VIP. 
Time of 
Time of 
motion. 
motion. 
feet. 
seconds. 
seconds. 
3 
Milne . . 
100 
13 
16 
6 
Nembrini , 
300 
11 
13 
4 and 5 
Kinch . . 
400 
8 
11 
During these last experiments it may be remarked that the observers at the 400 
and the 560 feet stations distinctly heard the sound of the ball striking the ground 
before seeing any motion in the mercury. 
