Magnetic Toys

Dipole Magnet and Iron Filings

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From Amazon: BUY NOW 
Magnetic Viewing Cylinder

Dipole Magnet and Iron Filings: visualizing the invisible- the magnetic field lines around a dipole magnet. In the presence of a magnetic field, ferromagnetic materials (such as iron) temporarily become magnets. Here the iron filings become dipole magnets and link end to end to follow and reveal the magnetic field lines associated with the permanent magnet within the hollow tube. 

Tesla's Egg of Columbus

Get this amazing (and affordable) reproduction here:
From engineDIY: BUY NOW: Tesla's Egg of Columbus
This version comes with a 35mm solid aluminum sphere. 

Get the aluminum phiTOP "egg"  here: BUY NOW phiTOP 

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. 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. 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. Finally, the ellipsoid top stands up vertically (when spun with sufficient rotational velocity) due to physics similar to that of the tippe-top. 

 

 

Golden Ferrofluid

Available on Etsy: BUY NOW Gold Ferrofluid Cell 

Golden Ferrofluid: colloidal ferromagnetic liquid in a specially prepared water-alcohol suspension. Curious behavior results from the interplay between magnetic force and surface tension. I'm still investigating the gold coloring and the specific makeup of the clear suspension fluid- both trade secrets it seems. The gold color appears to be a thin coating at the boundary between the ferrofluid and the suspension liquid.


Gyro-Carousel

Get this unique toy and amny other whimsical spinnign tops from this store:

From Etsy: BUY NOW: Gyro-Carousel Globe Tops

Gyro-Carousel: two terrestrial globe spin tops of the same mass hang balanced on the ends of a beam such that their rotational motion is allowed to transfer to the system as a whole. The tops are set to spin as usual, but here small neodymium magnets are embedded in the tops of their stems which allows them to connect and hang from metal pins in the beam. The angular momentum of each top is slowly transferred to the rotation of the system by the slight force of friction acting at the attachment point on the beam produced by the stem of the spinning top. Studies show that approximately 1% of the original rotational kinetic energy of the tops is transferred to the rotating beam, not much- but enough to produce this interesting effect. A design by physicist Christian Ucke and a product of KreiselArt (Ulrich Büker).

 

Chaotic magnetic Pendulum

These chaotic pendula are still available on eBay!

From eBay: BUY NOW: Krazy Leg Pendulum

Chick here for similar chaotic systems

Chaotic Magnet Pendulum: adding magnetic forces to gravity gives this pendulum chaotic motion- not random, but very sensitive to slight differences in initial launch conditions. Swipe to see a particular launch path that begins with a semi-stable orbit but then goes chaotic, captured with an attached LED and recorded with a slow shutter app. Arranging the dipoles magnets on the base leads to different patterns of motion- here white attracts and black repels. This vintage device is from the 1970s and was sold by the name “Krazy Leg” by Rathcon Inc.

Colored Ferrofluid Display Cells

Available on Etsy: BUY NOW Motion Ferrofluid Sculpture 

Colored Ferrofluid Display Cells: spectacular metallic blue, gold, and black display cells by czferro - colloidal ferromagnetic liquids in a specially prepared water-alcohol suspension. Curious behavior results from the interplay between magnetic force and surface tension. The gold and blue coloring appears to be from a thin coating at the boundary between the ferrofluid and the suspension liquid. Still exploring the details of the coloring and the specific makeup of the clear suspension fluid - both trade secrets it seems. 


Buda Ball

Only made by the Flyte team:

From Amazon: Buda Ball 

See also: The Story Clock

Buda Ball: a spherical magnet is pinned 1.5 centimeters from the surface of its hardwood base. Within the base is an innovative 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- even when the base is in a vertical orientation! Amazing magnetic levitation physics demonstrated with aesthetic design (and very clever engineering) by the flyte.se team- the only (non-superconducting) system I know of that can suspend in a horizontal direction as shown in this video. 

Levitating Inq Lamp

Get (or give!) a Curiosity Box subscription here: JOIN NOW: The Curiosity Box

I love VSauce!
The famous YouTube team puts together 4 boxes of "brain food" each year with fantastic and surprising stuff in each- and a great way to start a science toy collection! 

Get a squish Inq the Octopus here: BUY NOW: Squish Inq or check out Inq's Shop

Levitating Inq Lamp: Inq (the curious orange octopus) hangs illuminated and suspended by magnetic forces. I modified this lamp to incorporate the squish version of the @thecuriositybox mascot with a powerful neodymium magnet on top and a smaller magnet embedded with in Inq’s head- when the octopus is floating the bottom cord engages the light switch. 

Magnetic Sand Hourglass

Get one from these fine sources: 
From Amazon: BUY NOW Magnetic Hourglass 

Magnetic Sand Hourglass: ferromagnetic sand collects above a neodymium magnet in the wood base. Each particulate of ferromagnetic iron becomes a temporary dipole magnet in the presence of the magnetic field in the base. The tiny dipoles link up north ends to south ends, creating interesting patterns that reveal the magnetic field lines. 


Ferrofluid Interactive Lava Lamp

Available here:
From Etsy: BUY NOW Ferrofluid Lava Lamp

Ferrofluid Interactive Lava Lamp: special ferrofluid infused wax allows manipulation of the blobs of “lava” with a weak magnet, adding an interactive element to the already mesmerizing physics of convective heat flow, Archimedes principle, and immiscible liquids. Love the atomic rocket theme on this updated version of the 1960s classic physics toy. 

More here: Ferrofluid Interactive Sculptures

Toy Car with Magnetic Suspension Wheels

Available from these shops in Germany: 
From experimentis-shop.de: BUY NOW 
Mabrino Car 

From mabro.com: BUY NOW 
Mabrino Car 


Similar toys available here: 
From Amazon: BUY NOW 
Tegu Car Sets

Toy Car with Magnetic Suspension Wheels: Simple block car with clever wheel design. Small neodymium magnets embedded in the block lock on to steel balls, which raise the vehicle and become free to rotate providing the wheels for this simple toy.

Magnetic Suspension Lamp

Available for under $100 US: 
From Amazon: BUY NOW 
Magnetic Suspension Lamp 

From eBay: BUY NOW 
Magnetic Suspension Lamp 

Magnetic Suspension Lamp: not only does this lamp defy gravity, the LEDs in the bulb are powered through wireless induction (no batteries needed). This kind of levitation uses a control system with an adjustable electromagnet in a feedback loop with Hall effect sensors which allows for fine tuning of the magnetic field to exactly balance the pull of gravity. If this lamp design is unplugged (or the power goes off) the bulb assembly does not fall, but instead snaps onto the upper armature via strong permanent magnets embedded within. Amazing physics demonstrated by clever engineering! 


Magswitch

The smallest Magswitch in this product line, yet it can lift 17 lbs! The Magjig 60: 
From Amazon: BUY NOW Magswitch 60 
From eBay: BUY NOW Magswitch 60 

Magswitch: switchable permanent magnet- a twist of a knob turns on a magnetic field strong enough to lift this 5.2 kilogram (11 pound) chunk of railroad rail. Magnetic fields, when combined, can be either additive or subtractive. This Magswitch model, the Magjig 60, works by aligning and counter-aligning two strong neodymium dipole magnets within a field channeling ferromagnetic casing.