| 摘要 |
PURPOSE:To make it possible to easily recognize the actual condition of gut tension in an practical use state by constituting the gut stethoscope in such a manner as to generate sound of the interval that a racket generates in a general tension range after a certain time lag when the gut surface is hit. CONSTITUTION:This gut stethoscope is constituted as a tuning fork tire (a) having a tuning fork 2 integrally provided with a gut surface fitting part 1 at the other end. The stethoscope has a means for slightly delaying the sound generation from the tuning fork 2 and means for changing the interval of the tuning fork 2. The constitution of the gut stethoscope as an electronic circuit type (b) is possible as well. This electronic circuit type is also used as power source switch and provided with a hitting sensor at the end of a foldable rod for hitting and is so constituted as to automatically generate the sound of a certain oscillation frequency by a speaker 4 in the specified time after hitting. This oscillation frequency is controlled by a switch until the sound coincides with the interval of the racket. In addition, the display of the oscillation frequency on a display section 5 is possible. |
