Gear device turning continuous motion into alternating
Folio 130v: a toothed-wheel transmission, a sieve in action, and an emblematic motto
Shown upside down, a red-chalk mechanism sets a drum or wheel on a frame driven through a toothed-wheel transmission that, per the caption, changes continuous rotary motion into alternating motion. Below it a sieve (crivello) with a ribbon (nastro) is drawn in action. Running beside the sieve is the motto 'Non cado per essere unito' - I do not fall because I am joined together.
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Toothed-wheel transmission: continuous to alternating motion
A drum-like wheel mounted on an upright frame is driven through gearing. The caption explains that the toothed-wheel transmission converts continuous rotary motion into alternating (back-and-forth) motion.
Sieve and ribbon in action
Below the gear mechanism a shallow sieve or basin (crivello) is drawn with vertical elements rising above it, shown in action with a ribbon (nastro). It appears to be worked by the same device.
Motto: 'I do not fall because I am joined'
Beside the sieve runs the motto 'Non cado per essere unito' - I do not fall because I am joined together. The saying reads as an emblematic device attached to the mechanism.