THE AERODYNAMICS OF A SPINNING SHELL. 
383 
Table VII.—Observed Values of h + K and Ji—k + 2y, the Damping Factors for 
each'Group. 
Groups fired at a velocity of 900 f.s. apparently have negative damping and are not 
included. 
Group. 
Muzzle velocity, f.s. 
Calculated value 
of K. 
/?• -1~ k. 
h — k + 2y. 
Probable value 
of h. 
I. 22-24 
1119 
0-4 
1-9 
1-6 1 
1-8 
I. 25, 26 
1326 
0-3 
2-4 
1-2 
1-8 
I. 27, 28 
1563 
0-4 
3-0 
0-5 
1-8 
I. 1- 4 
2167 
0-7 
2-2 
0-6 
1-4 
I. 19-21 
2320 
0-8 
2 • 2 
- 0 • 2 1 
1-3 
II. 17-19 
1119 
0-4 
2-2 
1-2 
1-7 
II. 24 
1292 
0-2 
0-9 
0-6 
1-5 
II. 5- 7 
1585 
0-4 
3-4 
0-4 
2-0 
II. 22,23 
1589 
0-4 
33 
0-6 
II. 1- 4 
2027 
0-6 
3-0 
0-6 
2-0 
III. 17-19 
1119 
0-4 
0-7 1 
0-1 1 
10 
III. 20, 21 
1292 
0-2 
3-1 
0-9 
2-0 
III. 22, 23 
1567 
0-4 
3-0 
0-3 
2-0 
III. 1- 4 
2025 
0-6 
4-2 
1-7 
3-0 
IV. 13-15 
1078 
0-5 
0-7 
1-4 
1-0 
IV. 16-18 
1547 
0-5 
3-1 
1-2 
2-0 
IV. 24-26 
2120 
0-7 
5-0 
0-9 
3-0 
N.B.—The calculated value of k is obtained by using the value of the cross-wind force coefficient 
given in Table I. 
3 G 
YOL. CCXXI.— A. 
