| 摘要 |
<p>This invention is a device which is used by beginner tennis players, or players in similar games, in learning the control of the bending of the wrist. It consists of a wrist band and a finger band which are joined together so that the bending of the wrist during the playing of the game pulls and activates an electrical switch which is attached to one of the said bands, thus activating a sensor which gives a audible or visible signal, and which , at the same time, makes a graphic record of the bending of the wrist, which can be studied at a future date, for the purpose of analysis and correction.</p> |
