As you noted, that's duckpin bowling, which uses differently shaped pins than "standard" ten pin bowling; shorter yet heavier. The New York Times did a nice mi

As you noted, that's duckpin bowling, which uses differently shaped pins than "standard" ten pin bowling; shorter yet heavier. The New York Times did a nice mixed media piece a while ago on the sport and its fading popularity, which in part is because the additional difficulty in creating a mechanized pinsetter for this type of pin. There was a successful pinsetter invented, but the manufacturer went out of business in the 70s and declined the license the patent to other companies. Now there is a dwindling number of vintage pinsetting machines left, many of which have been cannibalized for parts to keep existing machines running. 0: http://www.nytimes.com/2016/05/29/sports/duckpin-bowling.html http://www.nytimes.com/2016/05/29/sports/duckpin-bowling.htm...