ISEN-ASTC-L is a service of the Association of Science-Technology Centers
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There's always McMaster-Carr..
Beryl
>ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>Incorporated, a worldwide network of science museums and related institutions.
>*****************************************************************************
>
>Concerning magnets for floating ring demo, I have had good luck with
>inexpensive ceramic magnets from Radio Shack, catalog number
>64-1888, pkg of 5 for $2.49, a little over 1 inch outside diameter.
>See www.radioshack.com for mail order or take a trip to your local
>Radio Shack store. To make them usable in our center I paint the N
>face of each disk red and the S face white. They are brittle and
>can break if abused violently. But they are strong enough to
>levitate on a vertical pencil (I use a board about 4 inches by 6
>inches with two 5/16 inch dowels about 5 inches long a few inches
>apart centered on the board and five or more of these ring magnets
>(loose, not tethered). The visitors can stack the magnets so they
>levitate, or cling, or combinations, using the color-coded poles as
>a key hint to understanding. There might also be a concern by some
>about infant choking if swallowed, but the hole through the center
>reduces that sort of risk. Also the magnets are strong enough to
>levitate but not strong enough to pinch and hurt little fingers.
>
>The website suggested by Edmonton, www.wondermagnet.com, is
>fascinating but I couldn't find these magnets among their ceramic
>offerings, and I think the supermagnet ring magnets would not only
>be small and expensive but also pinch-risks.
>
>Al Read
>Director, Science Discovery Center of Oneonta (NY)
>
>
>-----Original Message-----
>From: Informal Science Education Network on behalf of Pete Wheeler
>Sent: Wed 3/24/2004 12:43 AM
>To: [log in to unmask]
>Cc:
>Subject:
>
>ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>Incorporated, a worldwide network of science museums and related institutions.
>*****************************************************************************
>
>I am looking for cool magnetism experiments and dems. In particular
>I am trying to find some ring magnets to use for a floating ring
>magnet dem on a rod or piece of dowel etc. Ideally I want them to be
>plastic coated, big enough for kids to get hold of and experiment
>with, but not overly strong so that they may clamp down on someone's
>fingers. The only ones I can find are very small, 2 ½ to 3cm, are
>there any suppliers who do bigger ones? Any help on this would be
>great and any suggestions for other magnetic dems also appreciated.
>Pete
>
>Pete Wheeler
>Kids' Science State Project Officer
>Scitech Discovery Centre
>
>
> Horizon - The Planetarium opening 6 April 2004
>
>After you've seen a dome screen, everything else looks flat.
>
>www.scitech.org.au/horizon
><file:///C:/Documents%20and%20Settings/pete/Application%20Data/Microsoft/Signatures/www.scitech.org.au/horizon>
>
>
>Our Mission is to increase interest and participation by Western
>Australians in science and technology.
>
>P: (08) 9481 6295
>F: (08) 9321 2869
>W: www.scitech.org.au
><file:///C:/Documents%20and%20Settings/pete/Application%20Data/Microsoft/Signatures/www.scitech.org.au>
>E: [log in to unmask]
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>PO Box 1155
>WEST PERTH
>
>Western Australia 6872
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>
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--
Beryl Rosenthal, Ph.D.
Director of Exhibitions and Public Programs
MIT Museum
265 Massachusetts Ave.
Cambridge, MA 02139
Tel: 617-452-2111
Fax: 617-253-8994
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