The Levitron (R) is a small spinning top like magnet that is fully hovering in mid air unsupported. It is rather critical in its dimensions and operation. This requires adjustment by very small weight changes. It is commercially made and sold as a science toy. See their site for details.
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A homemade kit modified for fan cooling. This car power amp was rated at 100 W/channel into 8 ohms in the days when 100 W really meant it.
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This is a device I made in 1990 for use by elderly forgetful patients who may not remember medication times.
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I have a number of big silicon controlled rectifiers (SCR’s) of the “hockey puck” type.
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An amusing incidental use for this air injector is for a ‘spud gun’ or ‘potato cannon’. Jam the end of a 15 mm copper pipe into a potato then push the plug of potato down to the pressure end and ‘fire’.
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This coilgun 1.5kJ is shown aiming into a ballistic pendulum with a can as the target.
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This Jacob’s bi ladder impossibly seems to be going DOWN as well as up. But how can that be?
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Radioactive americium 241 from a smoke detector is a potent alpha radiation emitter with an energy of 5.38 MeV. Alpha particles are helium nucleii (2 protons and 2 neutrons).
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A Jacob’s ladder is driven by a voltage boosted microwave oven with a few steel wool sparkles thrown in for effect.
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Uranium ore (Yellowcake) emits gamma radiation. The Geiger counter reads 108,000 CPM through the plastic of the container.
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