Undershot water wheel and board joints
Water striking the wheel at point a, with sketches of jointed planks
The main sketch is a hydraulic wheel driven by water: the stream at n strikes the wheel at a, along the shorter line running from the centre to the rim. Beside it are small studies of how boards are joined. The mechanism couples a struck wheel with framing timbers.
On this page
Water wheel struck at point a
The water at n drives the wheel by striking it at a, the point lying on the shorter line drawn from the wheel's centre to its circumference. The note thus places the impact on the shorter radius near the rim.
Joints of boards
Small figures beside the wheel show ways of joining planks together. The caption records only that these are figures of board joints.