

Matthias Wandel, who makes wonderful wooden mechanisms, demonstrates his wooden 3-digit mechanical counter. It’s a terrific way to learn how these common devices work. He has build plans at his website.
Mathhias wrote a Marble Adding Machine how-to for MAKE.
6 thoughts on “How Mechanical Counters Work”
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i love Matthias! i have been watching foe few years !! A true Genus !
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