| 摘要 |
A tethered ball for practice batting and increasing the distance a ball player is capable of batting a ball is provided by a standard vertically adjustably supporting, at its upper end portion, a laterally projecting arm journaling a hub supporting one end of a flexible strand having a ball secured to its other end. A sensor in the horizontal arm, responsive to the number of revolutions of the hub in response to a bat hitting the ball is connected with a circuit contained by the horizontal arm and an LCD housing mounted display on the arm for indicating the equivalent distance of ball flight in response to the magintude of force applied to the ball.
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