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How to make a simple vacuum pump
Secure a bicycle or automobile hand pump. Open the pump and delete the piston. Un- screws the bolt that holds the leather washers. Reverse the washers by turning them over. Change the washers on the piston and insert in the pump cylinder. A pump of this sort will serve to do a lot of simple vacuum experiments
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Water: We all know that safe drinking water is essential for good health. Many of the diseases in our country are due to lack of supply of safe drinking water. ~nfortunatel~
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