Slotted kiln and vessel moulds; Paolo's rule on gears
With a note on how colliding bodies rebound
The sheet is dominated by a tall vertically-slotted structure with a merloned, hatched top — a kiln or vessel-forming frame — set above two curved cross-sectional profiles of a cup mould. Mirror-script surrounds the drawings on the left, right and lower margins, and a right-margin caption goes untranscribed in this bundle. The transcription supplied for the folio is instead mechanical: headed by a pawl marked n, it reports Paolo's rule that contiguous instruments move one another, notes its limit for a driving tooth, and closes with an observation on how two colliding bodies rebound according to how much each bends on impact.
On this page
Slotted kiln above two vessel-mould cross-sections
A tall structure ribbed with vertical slots and capped by hatched merlons rises over two curved, trough-like profiles that read as the cross-sections of a cup mould. The drawing belongs to the notebook's studies of forming and firing vessels; the notes lettered around it are not part of the supplied transcription.
Paolo's rule that contiguous gears move one another
Headed by a pawl marked n, the note reports Paolo's claim that no instrument moving another touching it can escape being moved by it in turn — as a wheel moves its pinion and the pinion the wheel. It adds the qualification that this is not general: if the tooth n drives the wheel, the wheel will not drive the tooth n through a whole revolution.
Rebound of two colliding bodies
Of the line of motion made by two colliding bodies, the one that bends least on meeting the first object strikes the second the harder with its rebound; the one that bends more against the first object does the reverse. It is a note on how flexibility governs the force of a rebounding impact.