Marble Adding Machine

[youtube http://www.youtube.com/watch?v=GcDshWmhF4A?wmode=opaque&w=560&h=315] Computers add binary numbers constantly, but we never see how. This elegant machine does the math using glass marbles. I started building marble track machines years ago using Lego. I experimented with all sorts of crazy ways for the marbles to descend. One was a rocker that shunted... Read more »

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