Reflected cold, and the bounce of a struck heavy body
A concave-mirror note joined to propositions on percussion, rebound and circular motion
Beneath a large converging ray-diagram, the leaf opens with the claim that cold gathered from a mirror's surface and thrown back to the apex of its pyramid multiplies as effectively as the sun's rays do. The main text then turns to mechanics: the height of a heavy body's bounce measures the power of the percussion, while a weaker blow gives a long low bounce owing to the power of its mover. A left-margin group states that every body flees opposite to the driving blow, that striker and struck act equally on each other, and that every motion seeks to be circular. Faint additional jottings appear in the margins beyond the supplied transcription.
On this page
Cold reflected and focused like the sun's rays
The cold taken from the surface of the mirror and thrown back to the point of its pyramid is multiplied with no less efficacy than the rays of the sun. The claim treats reflected cold on the same focusing model used for solar rays in the neighbouring mirror studies.
The height of a bounce measures the power of percussion
The elevation of the bounce of a struck heavy body, from the point where it struck, equals the power of the percussion. A weaker blow keeps the bounce long and low, not from the power of the percussion but from the power of its mover.
Action and reaction; every motion seeks to be circular
Every body flees in the direction opposite to the place from which the striker drives it. The body striking the object acts as much as the object striking the body, and every motion seeks to be circular.