Screw-and-cogwheel mechanism with plan views
A helical screw on a toothed drum, shown in elevation and from above
A worked-up drawing shows a helical screw rising from a cylindrical drum ringed with cogs, driven by a pinion on a horizontal shaft, described as the mechanism of folio 60v applied to a larger assembly. Two circular diagrams below give a horizontal section and a top view of the same device, with parts numbered 1 and 2. The plans reveal a toothed ring and a spoked wheel at its core.
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Screw and cogged drum, elevation
A helical screw stands on top of a cylindrical drum whose rim is set with cogs, engaged by a small pinion on a horizontal shaft. The caption identifies it as the mechanism of folio 60v enlarged into a bigger assembly.
Horizontal section and top view
Two circular plans show the device in horizontal section and seen vertically from above, with components numbered 1 and 2. A spoked wheel and a ring of teeth are visible in the plans.