Cast Shadows of Two Spheres beneath a Luminous Arc
A semicircular light source sending rays to a baseline, and two spheres each throwing a shaded cone
A semicircular arc across the upper page stands for a luminous body, from which straight rays run down to lettered points along a baseline. Below it two spheres each cast a hatched conical shadow toward points marked underneath. A short note in red chalk sits at the left, and mirror-script prose fills the space above and below the diagram; none of the writing is transcribed in the bundle, so further untranscribed text is present.
On this page
Luminous semicircle projecting rays to a baseline
A wide semicircular arc represents an extended light source, with straight lines drawn from it converging to lettered points on the horizontal baseline below. The figure sets up the illumination that the bodies beneath will interrupt.
Two spheres and their conical cast shadows
Two small spheres are placed one above the other in the axis of the light, each drawn with a shaded triangular cone of shadow tapering below it toward lettered points. Together they show the darkening cast when round bodies block part of the luminous arc.