Abstract: A ball throwing machine having a flat, circular resilient disc with an off-center opening formed therein through which a ball to be thrown is forced at a predetermined velocity. By properly positioning the flat circular resilient disc, having the off-center opening formed therein, a thrown ball can be made to spin about any axis perpendicular to the ball trajectory. A tubular barrel is mounted adjacent to the resilient disc so that as a ball is forced from the throwing machine it is forced through the opening in the resilient disc and into and out of the barrel. The barrel, which is positionable, permits the ball ejected from the throwing machine to be accurately aimed in any desired direction. A firing chamber is located adjacent the resilient disc on the side opposite the barrel. Balls to be thrown are fed into the firing chamber by a ball feeder.

Abstract: A portable self-contained scoreboard adaptable for use with a variety of different sports. The self-contained scoreboard has a plurality of variable numeral displays. Some of the numeral displays are constructed to function as a controllable clock which can count up or count down. The clock numerals can also be manually controlled to be used to indicate other desired information. A plurality of descriptive placards are provided with the self-contained portable scoreboard. The placards are constructed to be attachable to the face of the scoreboard. Selected placards can be attached to the scoreboard to render the scoreboard face applicable for scoring a variety of sports. The numeral and indicator light controls are then selected to be in accordance with the placard modified scoreboard face for use with the desired sport. This permits the scoreboard to be adaptable for use with a wide variety of sporting events. A pair of indicating timers adapted for use with the scoreboard can also be provided.