Marble Run Adding Machine

Prototyping the adder element concept the core of the invention is a modification of the divide by two flipflop to retain the marble that falls off the right side and keep it until the flipflop is flipped to the left by the next marble.

Marble run adding machine.

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29 99 54 99 33. A few months later i spent a couple of days in my workshop and built this binary marble adding machine. Motor drven with 602 parts 120 000 sets sold.