Some of these devices are, the wedge, the screw, the pulley and the inclined plane.
In the drawing (A) is the shaft, with a pulley (A), which turns in the direction of the arrow (B).
It is drawn up and let down by a cord passing over a pulley.
A pulley over the vat to draw out the rod or net is convenient.
The next operation was the reeving of the ropes over the wheels of ...