First, cut the top of the finger along the ... There is a lot going on in this simple mechanical hand. You can easily extend this project by making a simple wrist and arm. You will need to take ...

Mechanical moving-arm trafficators and hand signals were concieved at least as early as 1914, so whatever this little fake hand thing is, it's among the first of its kind. Based on the wrist ...

The diminutive “Curta” is a striking machine, a mechanical calculator ... adjust it with the other hand... I started to design the ideal machine from the outside first, before I designed ...