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Coin manipulation is the art of manipulating coins in skillful flourishes, usually on or around the hands. [1] Although not always considered coin magic, the flourishes are sometimes used in magic shows. The difficulty of the trick ranges greatly, from some that take a few minutes to accomplish, to much more complex ones that can take months ...
Wham-O Inc. is an American toy company based in Carson, California, United States.It is known for creating and marketing many popular toys for nearly 70 years, including the Hula hoop, Frisbee, Slip 'N Slide, Super Ball, Trac-Ball, Silly String, Hacky sack, Wham-O Bird Ornithopter and Boogie Board, [1] many of which have become genericized trademarks.
An electric current typically energizes the electromagnet to attract and hold the steel plate, keeping the door open. Unlike electromagnetic locks, the magnetic attraction of an electromagnetic door holder is usually weak enough that it can be manually overpowered at any time by anyone, allowing the door to close. [citation needed]
Given the relative permeability of a material can vary from around 250 for cobalt to around 5000 for soft iron and 7000 for silicon–iron, the choice of magnetic core can therefore have an important impact upon the strength of a magnetic lock. Also relevant is the choice of current, number of loops and effective length of the electromagnet.
Embroidery hoops come in various sizes and are generally small enough to control with one hand and rest in the lap. Hoops were originally made of wood, bone, or ivory; [1] modern hoops are made of wood or plastic. [2] Hoops may be attached to a table-top or floor stand when both hands must be free for sewing, as in making tambour lace. Standing ...
An active magnetic bearing (AMB) works on the principle of electromagnetic suspension and consists of an electromagnet assembly, a set of power amplifiers which supply current to the electromagnets, a controller, and gap sensors with associated electronics to provide the feedback required to control the position of the rotor within the gap ...
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