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A game of "Aunt Sally". Drawing from the 1911 edition of Whiteley's General Catalogue.. Aunt Sally is a traditional English game usually played in pub gardens and fairgrounds, in which players throw sticks or battens at a ball, known as a 'dolly', balanced on top of a stick; traditionally, a model of an old woman's head was sometimes used. [1]
Working principle for a ball bearing; red dots show direction of rotation. A four-point angular-contact ball bearing. A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races.