Auguste Broca, Artificial Limbs
“ Appliances with Mobile Joints.—In the course of work the direction of the wrist is changing at every instant, flexion, extension, pronation, and supination occurring, sometimes in order to move around the object, sometimes in order to maintain a suitable position when the movements of the shoulder and elbow vary the direction of the forearm.The consequence of this is that the worker learns to turn the piece of work around with his sound hand. ”
