THE AERODYNAMICS OF A SPINNING SHELL. 
387 
Table IX. (continued). 
Elevation 50 degrees (continued). 
Observations of February. 
Rifling 1/30. 
Mean observed 
time. 
Mean observed 
A. 
Calculated A. 
6-99 
4-54 
0-86 
15-03 
1-68 
1-65 
26-08 
1-99 
2-46 
Rifling 1/40. 
Mean observed 
time. 
Mean observed 
A. 
Calculated A 
6-33 
3-61 
0-63 
14-07 
1-40 
1-18 
24-93 
1-47 
1-86 
Elevation 30 degrees. 
Observations of April-May. 
Rifling 1/30. 
Rifling 1/40. 
Mean observed 
time. 
Mean observed 
A. 
Calculated A. 
Mean observed 
time. 
Mean observed 
A. 
Calculated A. 
10-04 
0-975 
1-05 
9-58 
1-63 
0-79 
20-6 
1-575 
1-77 
19-35 
0-80 
1-28 
27-9 
2-09 
2-06 
25-95 
1 ■ 04 - 
1-50 
Observations of February. 
Rifling 1/30. 
Mean observed 
time. 
Mean observed 
A. 
Calculated A. 
13-2 
1-40 
1-32 
22-52 
1-36 
1-86 
Rifling 1/40. 
Mean observed 
time. 
Mean observed 
A. 
Calculated A. 
13-02 
22-05 
1-73 
1-25 
0-97 
1-38 
