Percussion and bounce; a tool to draw out a crossbow bolt
Harder bodies rebound more; a wedge device shown before and after the blow
Folio 63r pairs a note on percussion — a falling body rebounds and strikes harder the harder and denser both it and the object it meets are — with three instruments. At the top is a tool 'to draw a crossbow bolt (verrettone) out of a wound,' drawn as spring pincers in two views. Below, a wedge (conio) device on a stand is shown twice: once 'in motion and at the beginning of the percussion,' and once with the motion finished, showing how the wedge a must remain after receiving the blow. A ball on an inclined line illustrates the rebound.
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Rebound grows with hardness
In falling, a body makes the greater bounce and percussion the harder it is and the harder and denser the object it strikes. A ball drawn on an inclined line illustrates the rebound.
Instrument to extract a crossbow bolt from a wound
A tool 'to draw a crossbow bolt (verrettone) out of a wound' is drawn as spring pincers, shown in two views at the top of the sheet.
The wedge a before and after the blow
One drawing shows the wedge device 'in motion and at the beginning of the percussion'; another shows the motion and percussion finished, indicating how the wedge a that receives the blow must remain.