The Future Kaiser of Prussia

On January 2, 1861, King Friedrich Wilhelm IV died and Prince Wilhelm's grandfather became Kaiser Wilhelm I. When the future Kaiser was four, his doctors presented him with a terrifying and barbaric machine designed to help him treat another one of his ailments. The thing that actually did help his arm to grow somewhat was a course of regular gymnastics which seems to have helped a lot. Sticks stuff worked, go figure. Like just actual exercise? Yes, that one did seeped out.