This is only the start, and you can experiment with larger diameter tubes or look at the mathematics underpinning the device. Of course, this is a simple device, and you can fit handles or use a large auger drill bit in a tight fitting cylindrical sheath. As you keep turning the screw, water will spurt into the upper bowl ![]() Turn the screw so that the flexible tubing can scoop up liquid.Insert the end of the screw into the lower bowl, moving the entire apparatus, if necessary, to ensure that the water will fall into the upper bowl.Place the other bowl on the stand or table.Place one bowl on the floor and fill it with water mixed with a few drops of food coloring.Secure the flexible tubing with waterproof tape.At the end, leave 1cm / ¾" hanging over the end of the PVC pipe, cutting off the excess with the scissors.Wrap the flexible tubing around the pipe, leaving about 2½cm / 1" between intervals, until you reach the end of the PVC pipe.Take your tubing and, using waterproof tape, secure it to one end of the PVC pipe, making sure that about 1.25cm / ½" hangs over the end.How the Archimedes Screw works ( Creative Commons) A stand, stack of books, or a low table.Sharp scissors (ADULT SUPERVISION REQUIRED).You can find this in a hardware store or aquarium store. Clear plastic flexible tubing - this should be about 2 cm / ¾" outer diameter and 1.25 cm / ½" inner diameter, although it does not matter if it is a little wider or narrower.A length of PVC pipe - 60cm / 2 feet should be enough, although you can make a longer device if you wish.What You Need to Make an Archimedes Screw Eventually, this creates an almost uninterrupted discharge of fluid at the other end. As the screw rotates further, this fluid is transferred to the next pocket while the screw scoops up more fluid from the source. One end of the device sits in a pool of fluid or particles and turning the handle to rotate the screw scoops up a small amount of fluid. The pump consists of an auger (helix) contained within a tight fitting cylinder, and the blades of the helix create individual pockets between the auger and the wall of the cylinder. ![]() The Archimedes Screw is a positive displacement pump, which takes fluid from a source and forces it to another location, where it is discharged. ![]() Archimedes Screw (Vaxjo, Sweden: Public Domain)
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