Page:Popular Astronomy - Airy - 1881.djvu/120

as shown in Figure 33, the ball which drops down to H, and the ball which is thrown in the inclined

Fig. 33.

direction and reaches the floor at K, will arrive at the floor at the same time.

Now, it is important to observe what are the circumstances on which the curvature of the path of a projected ball depends. In the first place, if anything were to increase the force of gravity, the track of the ball would be more curved. Thus, in Figure

Fig. 34.

34, if the velocity with which the ball is projected