Old advertisement for a Carnes Artificial Arm designed by amputee William T. Carnes, Sr. As his grandson says, "He had lost his right arm at the shoulder in a machine shop accident and he was an inventor so he made himself an arm. The arm was fully functional and had movable fingers and thumb. It functioned much like a real arm but with limitations of mechanics in those days. The product sold very well with the U.S. military buying many of them for soldiers who had lost limbs (yes, they made legs too). The company folded during the Great Depression. The Smithsonian has an arm and it is in a rotating display of artificial limbs. Our family has lots of information on the arm and the company." From the Modern Mechanix blog comments.