http://exhibitfiles.org/exhibition/view_casestudy.rss/119 Comments en-us Wed, 16 May 2007 08:42:15 -0700 http://exhibitfiles.org/exhibition/view_casestudy.rss/119#cid35 http://exhibitfiles.org/exhibition/view_casestudy.rss/119#cid35 Thank you for sharing this experiment, Adriana. It reminds me of the rich historical connections between exhibits and hands-on teaching and learning in classrooms, clubs, and workplaces. I wonder if anyone's familiar with the Mechanical Alphabet developed by Swedish inventor Christopher Polhem (1661-1751). ASTC's member, the Tekniska Museet, has some of this material.