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Chris
we made ours in wood (multiplex) with a rubber finishing.
They are not really light but children don't seem to have problems with it

kind regards,

Patricia

Patricia Verheyden
Manager of exhibits
Technopolis, the Flemish Science Center
Technologielaan, 2800 Mechelen, Belgium
tel. + 32 15 34 20 20; fax + 32 15 34 20 10
mailto:[log in to unmask]     http://www.technopolis.be

The above-mentioned messages/text and annexes do not commit F.T.I  or Technopolis in any way, unless otherwise agreed upon in writing or unless afterwards confirmed in a letter, duly signed according to the legal requirements. Neither can F.T.I  or Technopolis be hold liable in law on the basis of the content of these messages/text and annexes.



-----Oorspronkelijk bericht-----
Van: Informal Science Education Network
[mailto:[log in to unmask]]Namens Chris Sancomb
Verzonden: dinsdag 30 januari 2007 14:07
Aan: [log in to unmask]
Onderwerp: Arch blocks


ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************

We are redesigning a keystone arch activity that many of you are  
probably familiar with. Children build a keystone arch out of five 
blocks that they then can walk over. We had it made once, and the 
blocks, although nice and met most of our criteria were to soft and 
compress when a child of around 50 pounds sits on them. I am looking for 
other materials that will be lightweight enough for small children to 
handle, soft enough to not knock someone out when they sail across a 
room, yet sturdy enough to work under compression. Any suggestions would 
be helpful. Thanks

-- 
Chris Sancomb
Exhibit Designer
Providence Children's Museum
100 South St, Providence, RI 02903
[log in to unmask]
http://www.childrenmuseum.org
Come Play, Come Learn!

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