Lock for the Duchess's bath; the blow of a rebounding body
A door-lock mechanism, with a note on how a striking body loses impetus and rebounds more weakly
The note records a lock designed for the Duchess's bath and reminds the writer to gather every method of unlocking or releasing into a single chapter. It then states a principle of impact: a moving body that strikes its first target with the greater blow spends the more of its impetus there, so the blow of its reflected motion is the weaker. The straighter the line of motion stays at the first impact, the harder it strikes the second object. A pen-drawn toothed release wheel with a hanging weight accompanies the text.
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Lock for the Duchess's bath, and a catalogue of releasing methods
A note on a schiavatura (lock/latch) made for the Duchess's bath. The writer reminds himself to set out every way of unlocking, that is of releasing or triggering, and to collect them together in their own chapter.
Impetus consumed in a blow and the weaker rebound
The greater the blow a moving body delivers to the first object it strikes, the more of its impetus is consumed in that percussion, so the blow of its reflected motion is weaker. The line of motion that bends least at the first impact strikes the harder against the second object.