| 摘要 |
FIELD: visual control. ^ SUBSTANCE: invention relates to the method and means for visual control of the ball hitting the playing field border. This technical result is achieved due to the fact that in the method of visual control of the ball hitting the playing field border the grooves, which are approximately equal to half the diameter of the ball or more, are placed at the border outside the playing field and are filled flush with the surface of the playing field with a mixture of plastic matter and loose material in the ratio that provides the appearance of the print of the ball used when it hits the surface of the filled groove. ^ EFFECT: invention ensures the accuracy of visual control by relatively simple and inexpensive means. ^ 16 cl, 2 dwg |
