Shadow-projection diagrams with mirror-script notes
Pyramid-of-shadow constructions and a margin sketch amid untranscribed mirror-script
This opening carries columns of mirror-script together with a group of light-and-shadow diagrams; an old ink foliation reads 22 and 23 and the Institut de France stamp is present at the right. Near the foot, two triangular 'pyramid' constructions rise from a common base line, their crossing rays enclosing hatched bands that mark cast shadow, while a smaller paired-box sketch sits in the left margin. No transcription of the surrounding text was supplied, so that text is left untranscribed rather than read from the image. The drawings are the clearest guide to the page: the geometry of how shadow is projected.
On this page
Paired 'pyramid of shadow' constructions on a shared base
Low on the leaf, two triangular constructions rise from a single horizontal base line. In each, straight lines cross to form overlapping cones, and the overlapping zone is filled with fine parallel hatching to mark where shadow falls. Small numerals are set along the base beneath the figures.
Small paired-box sketch in the left margin
Higher up, at the left edge, a smaller diagram shows two little rectangles joined by ruled lines. It reads as a compact light-and-screen or aperture sketch attached to the discussion. No transcription accompanies it here.