The Bounce of a Cannonball: Trajectory and Proof
A bombard, an obstacle pierced at the apex of the shot, and its rebound
In red chalk, the sheet studies the flight of a projectile: a bombard fires a ball that pierces an obstacle at the highest point of its trajectory and rebounds after falling. The note reads that these are the bounces of a ball and its proof. Below the writing is a faint figure of a seated person in the act of rising, set on a cubic pedestal.
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Bounces of a cannonball and its proof
A bombard sends a projectile that pierces an obstacle at the highest point of its trajectory and rebounds after falling. The note names this the bounces of a ball together with its proof, treating the shot as a problem of projectile motion.
Seated figure rising from a cubic pedestal
Beneath the writing a person is sketched seated in the act of rising, placed on a cubic pedestal. The figure is only lightly indicated in red chalk.