>Has anyone any experience of designing / building / operating / evaluating
>mechanical, hydraulic or other non-electronic  systems that behave as
>simple digitizers / logic gates / calculators / computers, either passively
>or under the control of visitors?
>

The Deutsches Museum in Munich has a number of mechanical and hydraulic
models of logic gates, binary counters and sequencers in their information
technology exhibit.  All are under visitor control.


Fredric J. Raab
Interactive Media for Museums
Cambridge, MA, USA
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http://www.tiac.net/users/fraab