Finally, the ellipsoid top stands up vertically (when spun with sufficient rotational velocity) due to physics similar to that of the tippe-top.Magnetic toys such as Buckyballs and Magnetix can be swallowed by children, causing tears to a child's intestines and leading to injuries and even deaths. This rotating magnetic field from the coils under the concave glass induces electric eddy currents to flow in the aluminum ellipsoid- these currents then create their own magnetic field which oppose the initial fields underneath and pushes the ellipsoid to spin. The base has no moving parts- instead special copper windings (very similar to Tesla’s original design) form four electromagnet coils on a circular steel core, and a special circuit supplies each with AC currents in such a way that a rotating magnetic field is created. Tesla’s Egg of Columbus: an aluminum ellipsoid egg (PhiTOP) mysteriously spins and stands upright in this modern version of Tesla’s famous demonstration from the 1893 World’s Fair in Chicago that first showcased the principles behind wireless power transfer and his AC induction motor. Get the aluminum phiTOP "egg" here: BUY NOW phiTOP This version comes with a 35mm solid aluminum sphere. Get this amazing (and affordable) reproduction here:įrom engineDIY: BUY NOW: Tesla's Egg of Columbus Amazing magnetic levitation physics demonstrated by clever engineering by the this clock will work lying flat or hung on a wall vertically!
This kind of levitation uses a control system with adjustable electromagnet coils in a feedback loop with Hall effect sensors which allow for fine tuning of a magnetic field to precisely balance the pull of gravity. The orbit of the magnetic ball can be set to any period but also has default selectable presets to indicate the current hour, minute, or second. STORY Clock: a spherical magnet hovers one centimeter from the face of this amazing clock and orbits in a circle to indicate the time- for this video I selected an orbit period of 40 seconds to show off the motion. This very high-tech clock is also high end (more expensive than most items I feature), with excellent craftmaship and technology that is clearly hard to replicate so that it is only made by, and available from, the FLYTE team:įrom FLYTE: BUY NOW: US & Global Sales Story Clock or in EU Story Clock
Swipe to see the effect via magneview film which allows a visualization of the magnetic field- note that the field extends and is visible right through the thick copper.
Interestingly the Al tube is about half the mass of the Cu one, even though it is larger in volume. Interestingly the magnet falls a bit faster through the aluminum even though the walls are thicker- Al is only about 60% as conductive as Cu- so it takes more material to induce the needed magnetic field using aluminum. A changing magnetic field (such as that from a falling magnet) induces an electric current in the copper, which in turn produce an electromagnetic field (but of lesser strength) with opposing polarity. Available as a set, or individually (all come with the super powerful sphere magnet) here:įrom : BUY NOW: Copper + Aluminum Feel Fluxįrom Educational Innovations: BUY NOW Magnetic Viewing Filmįrom Amazon: BUY NOW Magnetic Viewing Filmįeel Flux Loop: original (copper) and the "Skill Flux" version (aluminum)- toys that use Lenz's Law to manipulate a very strong neodymium magnet.
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