Notes concerning “The Jaquet-Droz automata”

• Making a mechanical state machine via sheet cutting 2014-04-24 (updated 2015-09-03) (7 minutes)
• Differential spiral cam 2017-07-19 (9 minutes)
• An RPN CPU instruction set doubling as user interface 2017-07-19 (updated 2019-07-10) (21 minutes)