Water-screws in cylindrical and conical cages
Two near-identical lifting screws compared, with counts of their turns
The page continues the study of the coclea, showing a linear and a pyramidal screw linked to two pumps, one noted at ten turns and the other at twenty. A second study sets side by side two screws enclosed in a cylindrical or conical cage, one turned by a crank; the text traces the water rising from t to o, falling to n, forming an equal lever from n to f, then dropping back to t. The two are described as almost alike, differing in that the right-hand one climbs by a circular path, that is a flat screw.
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Linear and pyramidal screws driving two pumps
A linear screw and a pyramidal screw are connected to two pumps. The two devices are labelled with their revolutions, one at ten turns and the other at twenty.
Circulation of water through paired caged screws
The two screws are almost alike, beginning from the left one: the water rises from t to o, falls from o to n, and from n to f makes an equal lever; from f it falls to t and from t returns to o. The right-hand screw rises from f to t by a circular path, that is a flat screw.