On 09/10/2015 12:36 AM, Gregg Eshelman wrote: > On 9/9/2015 10:57 AM, Jon Elson wrote: > >> I have a rough design already made up, uses wheels that are >> advanced when the balls hit levers. Different length pins >> on the wheels allow the levers to drop the ball to two >> different tracks to perform the carry. >> >> I also had an idea to do BCD counters with mechanical >> flip-flops and then the FFs would raise pins that would >> select one of ten flags with the digits written on them. >> The balls would have to be pretty heavy to activate all that >> mass. > This one > https://www.youtube.com/watch?v=WaI7iTM3zLg > > I think I've seen this one before, probably online, but maybe at the NAMES show or something. My idea was wheels with numbers on them, advanced by levers that are tripped by the balls.
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