Dividers, an Archimedean screw and pump, a moated fortress, and a winch
A twin-barrel pump discharging into one pipe; a fortress with a central round keep
A page of instruments and devices. It gathers a pair of dividers (compasses), a cochlea (Archimedean screw), a pump whose two barrels discharge into a single pipe, and a winch. Below them a section through a fortress shows a surrounding moat and a cylindrical tower at the center, captioned as a design of a fortress.
On this page
Pair of dividers (compasses)
A drawing at the upper right shows a compass captioned as dividers (seste).
Cochlea (Archimedean screw)
A vertical screw device is labeled a cochlea, the water-lifting Archimedean screw.
Twin-barrel pump into one pipe
A pump is drawn whose two barrels (trombe) discharge into a single pipe.
Fortress with moat and central keep
A section through a fortress shows sloped ramparts around a surrounding moat with a cylindrical tower rising at the center, captioned a design of a fortress.
Winch
A rope-and-frame winch (argano) is sketched at the lower right.