![]() The use of two cords or wires to support the test cradle in testing the radius of gyration of a bowling pin. The area on which a ball makes contact with a lane. Portion of the lane after the lane conditioner ends up until the pins. ![]() The measurement of the vertical angle through which a ball rotates tilt is synonymous with the amount of “spin” a bowler has. The measurement of horizontal angle through which a ball rotates rotation is synonymous with the amount of “side roll” a bowler has. Path of which the axis point travels across the surface of a ball as the ball travels down the lane this path will always have the approximate same RG measurement as the ball travels. The WTBA recognizes the USBC as the only approved testing facility for the sport of tenpins.Ī ball where the RG (radius of gyration) values of the Y (high RG) and Z(intermediate RG) axes of the ball differ by more than 5% of the total differential of the ball. Used to describe equipment that has been sent in, reviewed, tested and found to meet all current specifications at the time of approval by the USBC. The area immediately in front of the lane before the foul line measuring at least 15 feet in length and not less than the width of the lane. Temperature of the surrounding area same as room temperature. The Asian Bowling Federation currently consists of 35 member federations. ![]() The governing body that embraces all national FIQ member federations bounded in the North by the Arctic, in the South by Australia and New Zealand, in the East by the West Coast of American Continent, with the exception of Hawaii, which shall be in the American Zone, in the North West by the Continent of Europe and in the South West by the East Coast of the Continent of Africa and Madagascar.
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