Slide rule clock prototype

This creation makes me wonder if anyone has made a similar clock but
with rotating drums, this making the 0 next to the 60 and the minute/
hour transitions smooth and simple.
http://blog.makezine.com/archive/2008/08/slide_rule_clock_prototyp.html?CMP=OTC-0D6B48984890

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Slide rule clock prototype

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