Knowing the angle [gamma] (Fig. 5) that the tangent to the orbit makes with the sun at a given point, and the angle [delta] of the track upon such tangent, as well as the velocity v of the comet, we can deduce therefrom the velocity V of the solar waves by the simple expression: V = v × (sinus [delta] / sinus([gamma] -

If we take the velocity A' B', double the velocity A B, and transfer it to the smaller circle, we have the velocity A C.

The reason is that it has been found that common shells break up against masonry, instead of penetrating it, when fired from these large high velocity guns.