Cross-armed hub mechanism
Four arms radiating from a central drum with a short vertical roller
Drawn upside-down in pen over red chalk, the sheet shows a mechanism in which four arms radiate in a cross from a round central hub carrying a short vertical roller, with block-like fittings mounted at the ends of the upper two arms. A fainter red-chalk sketch below repeats the circular hub. The e-Leo caption labels the page simply as 'mechanisms.'
On this page
Cross-armed hub with a central roller
Four straight arms spread in an X from a round central hub, which carries a short upright cylinder or roller. The two upper arms end in block-like fittings, suggesting bearings or weights carried at their tips.
Fainter red-chalk sketch of the hub
Below the main drawing a lighter red-chalk sketch repeats the circular hub with a small central boss, restating the same rotating element more schematically.