Kinds of Percussion, a Kite's Descent, and Squaring a Curve
Four kinds of motion and impact, a kite gliding into the wind, and a quadrature note
The right column names four kinds of impact and motion beside their sketches: simple percussion, compound percussion, motion born of motion and of percussion, and motion born of simple motion, then asks what distinguishes each. A short note observes that a kite descending against the wind carries the wind at its back so that its reflected motion grows greater. Along the left margin the quadrature theme returns, squaring a curvilinear portion n o by the 'rule of the 6th', beside a lettered figure n a b m o.
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Four kinds of percussion and motion
The four cases are labelled: simple percussion, compound percussion, motion born of motion and of percussion, and motion born of simple motion. The note then asks what the difference of each is.
The kite descending against the wind
When the kite descends against the wind, it has the wind at its loins, and the reflected motion becomes greater.
Squaring the curvilinear portion n o
a b are equal between themselves; but because the pyramid n m does not extend to the length of the portion n o, it is squared by the rule of the sixth, making the elongated square to the length of the portion n o.