System of opposed arches that tension one another
A sling-like release in which each arch straightens, making an almost circular motion
Two diagrams show a system of arched springs set against one another so that they mutually tension, their parts lettered a through p. The note reasons that when arch a performs its natural motion the others act in the same instant, since on releasing the sling each arch straightens by itself. Leonardo leaves open whether they all unlatch in a single moment, observing that the resulting motion is great and almost circular. A tripod stand supports the lower assembly.
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Simultaneous release of tensioned arches
When arch a performs its natural motion, c does the same, and likewise e, and so g at the same time, because on releasing the sling each arch straightens by itself. Whether they all unlatch in a single moment is left in doubt. The release produces a great motion, almost circular.
Lettered arch-spring assembly on a stand
The counter-opposed arches are labelled in groups a b c d, e f g h, i k l, and m n o p. The lower assembly rests on a tripod stand. The lettering keys the moving parts of the spring system to the accompanying argument.