Abstract: A system and method for evaluation of dynamics of golf clubs comprising a microphone (23) inserted inside the golf club shaft (18) which detects vibrations as sound waves and transmits signals indicative of the vibration's frequencies and amplitudes to a data acquisition system (28) for processing, display (30), and analysis. The apparatus may also be used for measuring natural frequency of flex through use of a rattler (61) or a micro-switch actuator (63).

Abstract: A system utilizing an array of high speed video cameras with image processors coupled to data microprocessors, data memory devices, video monitors, control terminals, printout devices, and related hardware and software. The system functions to identify, track, display and record all or selected portions of the path of one or more golf balls from the time each ball is struck, or after it is in flight, until it reaches its final point of rest. The recorded tracking information may be displayed in selected forms such as video or audio replays of the actual golf shot or selected portions thereof, or by printed data in character or graphic form. The tracking information may be reviewed for detailed study of all or portions of the track of the golf shot as well as the final resting place of the ball with respect to the intended target of the shot.

Abstract: A screw press for drying elastomeric polymers and the like having a cylindrical barrel and intermixed, substantially solid and apertured, discontinuous screw flights for more quickly initiating pressure and temperature increase of polymer in the barrel without increasing the back-up restriction and final pressure at the discharge end of the barrel.