194 Major J. G. Barnard on Elongated Projectiles. 
other,* but the causes they assign are inadequate, and, moreover, 
as the deviation of an elongated ball depends more on the diree- 
tion in which its axis happens to be deflected than upon the 
direction of the disturbing forces, no such uniformity in the de 
viations as is observed, would be produced, were friction on the 
The elongated projectile is discharged from the piece Mos 
of the air acts obliquely to the axis, and, with the ordinary ‘er 
of elongated projectiles, without grooves, its resultant passes. ‘ 
front and above the centre of inertia, tending to raise the pom 
* Thiroux’s theory requires that in the descending branch of the va red 
point of the ball shall be depressed below the trajectory; Panots, that 1 Dr 
tinue parallel to its original direction, and hence elevated above the trajectory. and 
Magnus supposes the axis to cv pretty nearly coincident with the trajectory, 4 
alls fi 
pposes the 
says that experiments made with red at low velocities bscir lee poses 
¢ To illustrate my meaning, take the friction theory of Pandt which SOPP ti 
5 axis elevated above the trajectory 
be so m ter dais 
of friction (equal all along the cylindrical surface) would affect the t -_ 
point a thus deflect the axis to the /eft, and produce a vere? nth rom itt 
“sf * . . 4 der aes ; 
t A a ing equivalent) ‘a 
9 
isted. This 
a 
Cr ss 
e away the possibility of this conical motion (in pre 
confine the axis to one plane, and it becomes as movable as if bg rota xxiv, 49) 
offers 
is clearly established in the Analysis of the Gyroscope (this ournal, [2], 
e following language is used, “the popular idea that a rotating — 1) 
is attribut 2 
Paniment of this apparent stability (i. e.the conical motion descr! accept 
and without which there is notte even resembling seaaria H yard 
With it, and the deviation of the projectile, which will certainly result ; 
