Exploding Disc Cannons, Slimemobiles, and 32 Other Projects by Neil A. Downie

By Neil A. Downie

Those curious and offbeat technological know-how experiments supply Saturday scientists of every age with new how one can reduce to rubble the basement and gross out mother - all within the identify of schooling! finished physicist and technological know-how author Neil A. Downie provides a large choice of artistic and cutting edge initiatives, from whacky automobiles to clothier demolition; from the skidmobile to the posture meter; from the rice grain ski leap to laser gentle indicates. every one scan comes with old historical past, a listing of kit, certain directions, and a whole clarification of the technology at the back of it. For these intrigued by means of any specific scan, Downie tells you ways to tinker with the preliminary "recipe.Whether printing with invisible ink or marveling on the energy of an exploding soda bottle, high-school technological know-how academics, inveterate tinkerers, and novice scientists will locate during this publication a whole diversity of initiatives certain to banish the boredom of a protracted Saturday afternoon.Praise for Downie's Ink Sandwiches, electrical Worms, and 37 different Experiments for Saturday Science:"A task good performed, and that i suggest it for someone attempting to get technology throughout to a non-specialist viewers. - Physics Today"The inventive writer of this publication has stuffed it with novel and fascinating demonstrations of physics, chemistry, and electronics experiments which are ideal for readers who like to tinker. - technology Books and Films"The technology in those initiatives is especially well defined and the instructions are stable. - Chemical schooling Today"Written in very transparent conversational style... humans probably want to test those experiments simply because they're enjoyable. - The Physicist"

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But what pressure of nothing is best? What is the optimum pressure for transmission of power? A pipe will not transmit much power if the pressure inside is very close to atmospheric pressure: when the pressure is equal to the atmospheric, there is no differential pressure drive, and no power would be transmitted at all. So the optimum pressure must be lower. At the other end of the scale, the power that can be transmitted at very low pressures must be low too: at an extremely low pressure, the mass flow through the pipe will be greatly restricted.

You will need to use a stepladder to complete the higher parts of such a tower. Beware of standing too close when it collapses— the total weight of the blocks will be considerable. The Hot Cheese Wire Bolt The buried wire technique works fine for quite large and strong structures, which is good. But it is not much like the original NASA exploding bolt. Spacecraft exploding bolts are normally under tension, whereas a simple butt joint of glued wood pieces is not, of course, strong in tension. By contrast, the hot cheese wire relies on a Nichrome wire poised and tensioned to cut through a cylinder of hot-melt glue.

46 NEW MOTORS 5 Rope Ratchet Motor Let us try to invent a device which will violate the Second Law of Thermodynamics. Let us say we have a box of gas at a certain temperature, and inside there is an axle with vanes on it. All we have to do is to hook on the other end of the axle a wheel which can turn only one way—the ratchet and pawl. Then the wheel will slowly turn, and perhaps we might even tie a flea onto a string hanging from a drum on the shaft, and lift the flea! . [But] the fundamental deep principle on which all of thermodynamics is based .

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