The Most Powerful Computers You've Never Heard Of

As a Sea Scout I became fascinated with the art and science of navigation and, by the time I was just 16, was successfully competing against experienced navigators 5 or 6 decades older. Little did I realize that the Tide and Current Tables that I was using were being calculated in those days of the 1950s, on mechanical analog computers designed a century earlier, nor of the key role they played in such wartime uses as anti-aircraft guns and bomb sights.