Pinwheel or vaned wheel (girandola)
Curved vanes radiating from a hub, laid out within guide circles
A faint red-chalk drawing shows a set of curved, blade-like vanes radiating from a central hub and inscribed within a circle, with small pivot points marked along the rim. The cataloguer tentatively reads it as a 'girandola,' a pinwheel or rotating vaned wheel. Lightly drawn guide circles indicate the curved forms were laid out geometrically.
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Curved vanes on a central hub
Several curved blades sweep outward from a single hub in the manner of a pinwheel or impeller. Small points near the rim mark where the vanes pivot or terminate.
Geometric layout of the vanes
A faint circle circumscribes the figure and the vanes appear struck from constructed arcs, so the curved pattern is set out by geometric construction rather than freehand.