Mechanical Instruments and Geometric Figures
Compass-like devices and roller mechanisms among triangles with inscribed circles
A square leaf covered with pen sketches of instruments and geometric figures against faint bleed-through text. At the top and lower left are compass- or divider-like tools and linkages; a curved mechanism carries pairs of rollers or wheels, and a framed row of circles suggests a roller assembly. Interspersed are triangular frames with inscribed circles, and at the right a disc bearing a short annotation is joined by a curved arm to a triangle. A note states that behind one round disc another like it, with similar gears, is to be placed; brief annotations accompany the drawings, and further untranscribed marginal jottings are present.
On this page
A paired disc mechanism with matching gears
Within one of the drawings a note specifies that behind the round disc there is to be another like it, fitted with similar devices or gears. The remark implies a symmetrical, double-sided mechanism built around a wheel or disc.
Compass-like instruments and roller linkages
The upper and lower-left areas carry divider- or compass-like tools and jointed linkages, while a curved element bears pairs of rollers or wheels and a framed row of circles suggests a roller assembly. These are studies of built instruments rather than static figures.
Triangles with inscribed circles
Several triangular frames enclose inscribed circles, one of them tying into a curved arm at the right. A small circle with crossed diameters appears at the lower left. The point label a marks one of these constructions.