Spiral in a star polygon, a vortex study and a mechanism
Two fragments of geometric and mechanical sketches; recorded as bearing no writing.
The catalogue records the two mounted fragments as bearing no writing, and indeed only drawings appear. The larger fragment is dominated by a circle enclosing an eight-pointed star (two overlapped squares) within which a spiral winds inward, beside a small mechanism sketched at upper left and a circular tangle of flowing, curling lines at upper right that reads as a study of swirling, vortex-like motion; a number '173' stands above the main figure. The lower fragment carries red-chalk interlocking coiled forms and, at right, a small crescent-and-square figure. These drawings are not transcribed in the source, which notes only that the sheet is devoid of writing.
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Spiral wound within an eight-pointed star polygon
A large circle encloses an eight-pointed star formed by two overlapped squares, and within it a continuous spiral winds inward toward the centre — a construction in rotational geometry. The figure is centred on the larger fragment, with the number '173' inscribed just above it.
Study of swirling, vortex-like motion
At upper right a circular field is filled with flowing, curling strokes that spiral and interlace, suggesting rotating or turbulent movement rather than a rigid geometric outline. It sits apart from the ruled star-polygon figure to its left.
Small mechanism sketched at upper left
A small, loosely drawn device occupies the upper-left corner of the larger fragment, with a rounded wheel- or pulley-like element set within angular framing lines. It is fainter and more summary than the geometric figures below.