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2. Plate trick - Wikipedia

   en.wikipedia.org/wiki/Plate_trick

   In mathematics and physics, the plate trick, also known as Dirac's string trick (after Paul Dirac, who introduced and popularized it), [1] [2] the belt trick, or the Balinese cup trick (it appears in the Balinese candle dance), is any of several demonstrations of the idea that rotating an object with strings attached to it by 360 degrees does not return the system to its original state, while ...

3. Anti-twister mechanism - Wikipedia

   en.wikipedia.org/wiki/Anti-twister_mechanism

   As the disk rotates the plane of this cable is rotated at exactly half the rate of the disk so the cable experiences no net twisting. What makes the device possible is the peculiar connectivity of the space of 3D rotations , as discovered [ 3 ] by P. A. M. Dirac and illustrated in his Plate trick (also known as the string trick or belt trick ...

4. Arago's rotations - Wikipedia

   en.wikipedia.org/wiki/Arago's_rotations

   Arago's rotations is an observable magnetic phenomenon that involves the interactions between a magnetized needle and a moving metal disk. The effect was discovered by François Arago in 1824. At the time of their discovery, Arago's rotations were surprising effects that were difficult to explain.

5. Frozen mirror image method - Wikipedia

   en.wikipedia.org/wiki/Frozen_mirror_image_method

   Fig. 1. Illustration of the frozen mirror image method for a simplest case of the magnetic dipole over the flat superconducting surface. Frozen mirror image method (or method of frozen images) is an extension of the method of images for magnet-superconductor systems that has been introduced by Alexander Kordyuk in 1998 to take into account the magnetic flux pinning phenomenon. [1]

6. Magnetic particle clutch - Wikipedia

   en.wikipedia.org/wiki/Magnetic_particle_clutch

   A magnetic particle clutch is a special type of electromagnetic clutch which does not use friction plates. Instead, it uses a fine powder of magnetically susceptible material (typically stainless steel ) to mechanically link an otherwise free-wheeling disc attached to one shaft, to a rotor attached to the other shaft.

7. Magneto-optical drive - Wikipedia

   en.wikipedia.org/wiki/Magneto-optical_drive

   A Magneto-optical disc surface has sector partition rectangles. A magneto-optical drive is a kind of optical disc drive capable of writing and rewriting data upon a magneto-optical disc. 130 mm (5.25 in) and 90 mm (3.5 in) discs are the most common sizes.

8. Flip-disc display - Wikipedia

   en.wikipedia.org/wiki/Flip-disc_display

   The flip-disc display (or flip-dot display) is an electromechanical dot matrix display technology used for large outdoor signs, normally those that will be exposed to direct sunlight. Flip-disc technology has been used for external destination signs on buses and trains across North America , Europe and Australia , as well as for variable ...

9. Spin-stabilized magnetic levitation - Wikipedia

   en.wikipedia.org/wiki/Spin-stabilized_magnetic...

   Spin-stabilized magnetic levitation is a phenomenon of magnetic levitation whereby a spinning magnet or array of magnets (typically as a top) is levitated via magnetic forces above another magnet or array of magnets, and stabilised by gyroscopic effect due to a spin rate that is neither too fast, nor too slow to allow for a necessary precession.