Mechanical Slide Adder Calculator Addiator decimal binari time add subtract

You can build your own analog pocket calculator in the counting systems with the base of 10 (decimal), 6, 2 (binari) or for adding/substracting times. So to say you can build your own analog (cause its works without electricity) digital (cause one option is binari) calculator. Plan for buildung the calculators and manual for using them ist in german with symbols, so you can understand it anyway. Help for building it up: https://www.youtube.com/watch?v=YGl4pKwl0Ow