A pump comprising an endless string, working over a drum or wheel where it's moved, and dipping below the liquid become raised. The sequence features at periods disks or lifts which fit the pipe whereby the ascending part passes and carry water to the level of release.
A pump composed of an endless chain, working over a drum or wheel by which it is moved, and dipping underneath the water become raised. The sequence features at periods disks or lifts which fit the pipe through which the ascending part passes and carry water to the stage of release.
How would you define chain pump?