A baseball with a self-contained speed-measuring module positioned within a hollowed-out portion of the solid core of the ball, with the upper portion of the module being a display unit that indicates the speed at which the baseball was thrown over a fixed distance, the read-out of the display unit being...http://www.google.de/patents/US4775948?utm_source=gb-gplus-sharePatent US4775948 - Baseball having inherent speed-measuring capabilities
