Parts of mechanical devices: toothed wheels
Red-chalk sketches of a cogwheel on its shaft and gear parts
Red-chalk sketches of parts of mechanical devices, as the caption records. In the lower left a toothed cogwheel is drawn set on a horizontal shaft and meshing near a squared block, while above it a smaller assembly with a rectangular coupling sits on its own axle. Faint show-through of writing from adjacent leaves is also visible across the page.
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Cogwheel on a shaft
A toothed wheel (ruota dentata) is drawn in red chalk on a horizontal shaft, engaging near a squared block. Above it a second, smaller assembly with a rectangular coupling or bearing block rests on its own axle.