Geometric square construction and a radial wheel mechanism
A soft-lead square within a square sits above a fine ink fan of radiating lines centred on a cluster of wheels.
The transcription source notes only that the leaf bears no writing; the interest lies wholly in its drawings. In the upper half, drawn in soft lead, a large square encloses a rotated square (a diamond) and an inner octagonal figure, a centralized geometric construction. Below, in fine ink, two focal points throw out a symmetrical fan of many ruled lines forming a pointed-arch outline, centred on a compact cluster of circles or wheels with a shaft descending from it. The scholarly tags associate the sheet with the physics of straight and curved parts joined to or detached from a motor, and with machines and architecture.
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Square within a rotated square with inner octagon
The upper figure is built up in soft lead: an outer square encloses a diamond set corner-to-side within it, and inside that an octagonal figure with diagonals meeting at the centre. The construction is symmetrical, a centralized geometric scheme rather than a finished object.
Radiating fan centred on a cluster of wheels
In the lower half, drawn in ink, fine straight lines radiate symmetrically from two points to form a broad pointed-arch outline. At the centre sits a compact group of circles that read as wheels or discs, from which a shaft runs downward, suggesting a mechanism turning about a central hub.