 | Inspired by an American tin toy of around 1916, this educated monkey performs multiplications without any mistake. His feet show the two numbers to multiply and a hole above his hands shows the correct result. The mechanism of this DIYs project is very interesting and can be studied and ... »
multiply, hole
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 | Building a vegetable oil stirling engine helps to demonstrate different scientific properties: Expansion and condensation of the air under the influence heat Principle of operation of a piston Conversion of thermal energy into motion Use of a bio-fuel This DIYs shows a simple prototype of ... »
stirling, condensation, piston, prototype, steam
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 | The Pet Star water rocket car is an environmental friendly vehicle. A Pet bottle is used to stock air and water. The air is pressurised with a bicycle pump . The water is expelled because of this great pressure and pushes the car forward (action<>reaction principle). This DIYs project helps to ... »
rocket, pressurised, bicycle, pump, pushes
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 | Why not build a magnetic alarm to protect your room or your drawers from any intrusion ! This DIYs project is an electronic device which detects the proximity of a magnet. If the magnet is moved away, the alarm will ring. ... »
intrusion, detects, proximity, magnet
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 | This pantograph can copy a drawing about 1.5 times larger than the original size. Easy to make, it's a nice DIYs project to introduce the concept of scale and some notions of geometry. ... »
pantograph, geometry
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