Large converging-ray diagrams (ff. 88v-84r, backlit)
Two fan-shaped bundles of rays gathering to a focus, with a small stand apparatus
A transmitted-light spread dominated by two large fan-shaped constructions in which many finely ruled straight lines gather from a curved arc toward a focal point, consistent with the reflection of parallel rays off a curved (concave) surface. The bundle supplies only a caption ('Figure with letters and numbers') and no transcription, so the reasoning is not given here. A small drawing of a bowl-like vessel on a stand appears at the lower right, and both leaves carry abundant mirror-script that the bundle does not transcribe.
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Rays converging to a focus
Two large fan-shaped bundles of straight rays are ruled from a curved arc toward a single gathering point, the pattern expected when parallel rays reflect off a concave surface toward a focus. Letters and numbers mark points along the construction.
Small apparatus on a stand
At the lower right a small bowl-shaped vessel is drawn resting on a footed stand with lines above it, apparently a setup related to the ray constructions above.