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Archimedes Screw Pump

Materials Required
A Serving Tray, Two plastic bowls, Aluminium rod of one foot in length, A one foot PVC or Plastic pipe with a diameter of one inch, Two plastic bottle caps which can fit on the PVC pipe, One meter long plastic transparent flexible tube with a diameter of one centimeter, Two small screws, Adhesive tape, Water colours
Method
1. The Pump: Fix the plastic tube on the outer edge of the PVC pipe with a screw. Wind the plastic tube around the PVC pipe till it reaches the other end. Fix it there with the other screw. Put a hole in the middle of the plastic caps and fix them on both ends of the PVC pipe.
2. The Pump Holder: Take the Aluminium rod and bend it in the shape of alphabet 'N' leaving a gap of two inches from one end. Place it on one side of a tray as shown in the picture. Fix it on the bowl with a tape. Bend the long end of the aluminium rod at about 45 degrees.
3. Fixing the Pump: Fix the pump on this aluminium road by inserting the rod through the hole.
4. Assemble: Place the two bowls as shown in the picture. Take a mug of water and add little colour to it. Pour it in to the bowl where the aluminium rod is fixed.
5. The Action: Slowly rotate the PVC pipe by holding on the top edge of it and watch the water climbing up through the plastic tube. Continue rotating and the water starts falling in to the second tray.




A Little Background:
Archimedes' screw, a simple mechanical device believed to have been invented by Archimedes in the 3d cent. B.C.
The Archimedes screw is a positive-displacement pump.
A positive-displacement pump traps an amount of fluid from a low-lying source and then forces the fluid to move to a higher discharge location.
To move water, simply rotate the screw.
As the screw moves, it scoops up a small amount of water into the first pocket.
On the next turn of the screw, the first pocket of water moves to the second pocket, and a new scoop of water enters the first pocket.
This motion continues until finally the first scoop of water comes out at the other end.

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