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Certain popular second hand selling sites appear to have a reasonable proliferation of vinyl turntables for not very much money. I'd suggest that a belt driven one would work better for your purposes because even if you cannot get the motor to reverse by swapping the wiring over, you can reverse the rotation of the deck by having one belt be looped onto its ...


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A fair number of laboratories use toys like Fischer Technik or Lego in simple experimental setups. You could use them or similar, modular equipment to build a frame that connects 2 stirrers with an even number of same size gearwheels. (I'm certain I don't have to explain to you, but maybe some other users might not know immedieately) The even number of gears ...


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if you don't want to insert a stirring implement of some sort, you could spin the entire container, it'd just take a long time for the liquid to get up to speed. Measuring the speed of the stirrer is easy: stick a revcounter on it. These usually consist of an object stuck to the moving part of the stirrer, and a sensor that detects that object (a vane ...


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