Magic slate how does it work

There are Magic Slates emblazoned with the visage of nearly every youth-targeted intellectual property from the s to the s and even quite a few beyond that. Pretty much every Hanna-Barbera character has one, from the noble and beloved Cattanooga Cats to the loathsome, accursed Shirt Tales.

The Magic Slate is a grand unifier. It's profoundly universal. If a concept can be represented using images it and can and most likely will be printed on a Magic Slate frame. There came a time when it was called on to do important, dangerous work and the Magic Slate did not shy away from this portentous duty.

The Russians had gifted the embassy a carved, wooden facsimile of the Great Seal of the United States. This seal was found to be fitted with a hidden listening device and this revelation forced everyone working in the embassy to assume the whole place was wired for Soviet surveillance. Magic Slate were cheap and plentiful.

They provided a way to communicate silently while leaving behind no physical residue that could be reassembled and decoded if dispossessed of carelessly. All it takes is a flick of the wrist and it's all gone. The assumptions made by the workers in the embassy proved correct. The Soviets were, in fact, listening to their conversations. The Magic Slate served its country ably. The system under study figure 1 is composed of a silicon base upon which a layer of niobium with a thickness of nm is placed.

This layer of niobium is in turn covered with a layer of ferromagnetic material in this case Fe 20 Ni 80 ; the magnetic field H is applied to all of these layers. As can be seen in the sketch, the ferromagnetic layer does not have a regular form square or rectangular but has been designed in such a way as to directly show how the behavior of the vortices is influenced in accordance with the different angles.

Sketch of the system under study, built on a silicon substrate in grey. It is covered with a polygonal ferromagnetic layer in orange composed of Fe 20 Ni 80 or Permalloy. Two systems were used with magnetic layers of different thicknesses: 50 nm or nm. Furthermore, a thin layer of silicon oxide placed between the superconductor and the magnetic material made it possible to electrically isolate the two materials.

During the experiments, the system is placed in a perpendicular magnetic field H represented by a green arrow. To erase, you press a button that sends a charge between the plastic sheets which are coated with conductive film and re-scatters the spirals.

How does an Etch A Sketch work? An Etch A Sketch has a thick, flat gray screen in a red plastic frame. There are two white knobs on the front of the frame in the lower corners. Twisting the knobs moves a stylus that displaces aluminum powder on the back of the screen, leaving a solid line. The knobs create lineographic images. The Magna Doodle, first released in , is a natural meld of the Etch-a-Sketch, the Magic Slate, and Woolly Willy: It combines the frame construction of the first, the stylus function of the second, and the magnet science of the third to make a durable and very adaptable drawing surface.

Is Etch A Sketch magnetic? Aluminum powder is the dark the pigment that appears on the screen of an Etch-a-Sketch when you manipulate the two knobs in each lower corner.

To delete what you wrote, you simply lifted the plastic film off of the wax paper and the film was blank again, ready for your next drawing or secret message. The story of the Magic Slate starts to get interesting right from the beginning. In the early s, the owner of a corset factory, Mr. However, the inventor was arrested that very same night, so he called Mr. Watkins and said he would give him the rights to the invention if Watkins would pay his bail. Watkins agreed.

Watkins tweaked the invention a little, replacing the tissue with a piece of opaque plastic film and got better results. He had planned to use the paper saver at work for doing inventory, creating timesheets and other things that would, indeed, save paper in the factory.