Clock hammers, the worm screw, and equal effort on a bar
A worm-and-nut of great power; the freest blow is strongest; cord beats friction
The page argues that a hammer fixed anywhere along the bar n m keeps its mover a at equal labor, because ring m carries fifteen times the weight of the opposite ring n, cited to the 5th of the 6th (text 2). A worm-screw (vite perpetua) turned by its pinion m n against a fixed nut (madre) f S is judged of great power (text 4). A row of clock-hammer studies lettered a m n, b S, c r, d supports the closing rule that the freest blow is the strongest: a clock hammer pulled by a cord beats one pushed by a spring, whose friction robs it — and if a spring must push, its friction should act upward so it gains force on the handle (text 6).
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Equal effort wherever the hammer sits on bar n m
The bar where the hammer's handle is fixed presses on ring m with fifteen times the weight borne by the opposite ring n, by the 5th of the 6th. Wherever the hammer is fixed along the bar n m, the mover a will always have equal labor.
Worm screw turning a fixed nut (madre) f S
If the perpetual screw is turned about with its pinion m n while the nut f S stays fixed in place yet free to rotate, the turning of that nut will be of great power. A note records that the manuscript reads 'cierta'.
The clock hammer: cord-pull beats the friction-push of the spring
The freest motion gives the strongest blow: a clock hammer pulled by a cord from the spring is stronger than one thrust by the spring's contact, because friction robs the pushed hammer of power. If a spring must push, its friction should act upward, since the spring then finds the handle farther from its fixing-point and gains more force on it.