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2. 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 ...

3. Magna Doodle - Wikipedia

   en.wikipedia.org/wiki/Magna_Doodle

   A Magna Doodle drawing board. Magna Doodle is a magnetic drawing toy, consisting of a drawing board, a magnetic stylus, and a few magnet shapes.Invented in 1974 by Pilot Corporation, [1] over forty million units have been sold to date worldwide, under several brands, product names and variations, including Tyco and Mattel/Fisher Price.

4. Display board - Wikipedia

   en.wikipedia.org/wiki/Display_board

   A display board, also known as poster board, is a board-shaped material that is rigid and strong enough to stand on its own, and generally used paper or other materials affixed to it. Along with quad charts , display boards were an early form of fast communication developed by the National Weather Service of the United States Department of ...

5. Magnet - Wikipedia

   en.wikipedia.org/wiki/Magnet

   Placing the magnet in an alternating magnetic field with intensity above the material's coercivity and then either slowly drawing the magnet out or slowly decreasing the magnetic field to zero. This is the principle used in commercial demagnetizers to demagnetize tools, erase credit cards, hard disks , and degaussing coils used to demagnetize ...

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Halbach array - Wikipedia

   en.wikipedia.org/wiki/Halbach_array

   The rotating pattern of permanent magnets (on the front face; on the left, up, right, down) can be continued indefinitely and have the same effect. The effect of this arrangement is roughly similar to many horseshoe magnets placed adjacent to each other, with similar poles touching.