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The u shaped magnets are as David T stated, military surplus radar
magnets and they are extremely scarce if not nonexistent on the
surplus market.

Believe it or not, there is a new source of recreated "radar" magnets
for exhibits. They are made in Switzerland but they can ship anywhere
in the world. See the URL below for more specifics.

http://www.technorama.ch/rentals/radarmagnets.html

>I'm looking for a source for a large "U" shaped permanent magnet for the
>magnetic sand exhibit.
>
>See http://www.exploratorium.edu/xref/exhibits/black_sand.html  if I'm
>not making myself clear.
>
>I've contacted a few companies in our area that make magnets, but have
>not found one that  has these.
>
>Any help would be appreciated.
>
>Thanks,
>
>Ben Randell
>Program Specialist
>Science City @ Union Station
>Kansas City, MO


--
Claire Pillsbury

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