Geometric Studies of Gridded Spheres and a Square
Faint construction lines with grid-covered hemispheres and a small hatched square
The verso carries a few faint pen studies scattered across largely blank paper, with staining and small ink blots. A hemispherical bowl is covered by a mesh of curving grid lines and pierced by a straight line, accompanied by a second gridded circular form and a small hatched square. Ruled construction lines cross the upper left, suggesting trials of ruled and gridded curved figures.
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Grid-covered hemisphere pierced by a line
A hemispherical bowl is drawn covered with a network of curving grid lines, with a straight line running through its centre. The mesh maps the curved surface as a set of intersecting arcs. The form sits toward the middle of the sheet.
Second gridded circular form and a hatched square
Below and to the right a smaller circular form is filled with concentric and radial lines, beside a small square shaded with parallel hatching. Faint straight construction lines cross the upper left of the sheet. The marks read as trials of ruled and projected figures.