Here, a hollow tube is wrapped around a central shaft, which is turned by the hand crank. Because the shaft is at an angle, the tube has low points that catch water, and as the shaft turns, the water travels "up" the tube by means of gravity forcing it to the next local low point, until it reaches the top
The Screw Pump is one of the simplest positive displacement pumps, and has been used for thousands of years to move water, mainly for irrigation purposes.
An example of the Archimedes Screw in action, in the enclosed screwed-shaft configuration.
A screw pump can have a few different configurations, including a tube wrapped around a shaft, or a tube enclosing a shaft with a screw wrapped around it.
