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Bowls detects
From;  Author:Stand originally

  • The lay particular stress on between the top of the ball, bottom must not be more than 3 ounce;
  • The left, on the right side of lay particular stress on of the ball must not be more than 1 ounce;
  • Of the ball before, hind lay particular stress on must not be more than 1 ounce;

(2) , 8 pounds (contain) the ball to 10 pounds:

  • The lay particular stress on between the top of the ball, bottom must not be more than 2 ounce;
  • The left, on the right side of lay particular stress on of the ball must not be more than 3/4 ounce;
  • Of the ball before, hind lay particular stress on must not be more than 3/4 ounce;

(3) , the ball under 8 pounds:

  • The lay particular stress on between the top of the ball, bottom must not be more than 3/4 ounce;
  • The left, on the right side of lay particular stress on of the ball must not be more than 3/4 ounce;
  • Of the ball before, hind lay particular stress on must not be more than 3/4 ounce;

3, hardness:

Bowling is not gotten below normal temperature indoors under 72 degrees. The hardness that also must not use chemical method or other method to change a globe at will.

3, the measurement of bowls centre of gravity and hardness

Measure requires tool: The bowling balance, feet that draw a line, pen that draw a line, sclerometer.

Bowling balance is one measures bowls major level, this balance basically has: Balance put oneself in another's position, advocate cursor, deputy cursor, gradienter and counterbalance composition. The counterbalance has 4: Of 8 pounds, 2 of 3 pounds, 1 of 1 pound.

Detect measure:

1, debug ball balance:

Set ball level on stable platform, move balance style the standard (adjust gradienter) , advocate, deputy cursor adjusts “0” scale to go up, again the balance bearing lever finger and balance are aimed at neat. (See a picture)

Qj2.gif (1962 byte)

2, picture line:

bowling before detect the picture gives crossed center clue. Specific means is as follows: big toe aperture to the member that detect, take forefinger, ring finger to point to the center A of aperture, b connects line midpoint D, the E of the midpoint that connect a line of C of midpoint of aperture of reassume big toe and D, it is the center of pushball at this o'clock. By E the dot does CD to connect the perpendicular of the line, the extension line that passes CD so is ball cent or so side, its vertical line is ball cent around side (see graphic representation) . And face pointing to aperture is a side, its correspondence face is bottom side.

Qj3.gif (2428 byte)

3, measurement technique:

The ball of fine the picture line puts on the balance (note: Right now big toe aperture still aims him handlers) get on group of balance of 4 lines alignment 4 are nodded, move deputy cursor to “0” on. Deserve to go up the counterbalance of appropriate weight is mobile advocate cursor, after the balance is balanced advocate the weight that the scale that cursor place indicates is pushball, (note: Advocate the scale of cursor, every case is 1/4 ounce) (see a picture 1)

Qj4.gif (2607 byte)

The measurement that controls lay particular stress on (emphasize particularly on namely)

the ball that measures weight, rotational 180 degrees. Right now, must not move advocate cursor, can move only deputy cursor. After towards the left of mobile deputy cursor is mobile, the numerical value that indicates needs numerical value to slanting. After moving right, the numerical value that indicates needs numerical value to slant instead. (See a picture 2)

Qj5.gif (2993 byte)

The measurement of around lay particular stress on (point to namely heavy)

Measure the ball that gets left, right error, again rotational 90 degrees (note: Still do not move right now advocate cursor) , mobile deputy cursor, when after the balance, remember this scale is worth. Next, turn the ball 180 degrees still move deputy cursor, after two times the value has adding decreasing, this numerical value is the numerical value of around lay particular stress on. (See a picture 3, 4)

Qj6.gif (6101 byte)

Of coping and quantity of bottom lay particular stress on measure (support namely heavy)

Above all, flip through the ball up and down 90 degrees, of the aperture of course big toe that draws the place on the ball and center of two finger aperture connect a line, aim what the balance encircles to go up along, mobile deputy cursor (advocate cursor still maintains do not move) , remember the weight that weighs. Next, flip through right 180 degrees, again mobile deputy cursor. Increase the numerical value of earning to the numerical value that estimates last time, after decreasing, it is coping and numerical value of bottom lay particular stress on.

Qj7.gif (8177 byte)

The measurement of hardness:

The hardness of bowling surface, must indoors below normal temperature, move sclerometer to be measured with the hand. The hardness that measures is not gotten under 72 degrees. When measuring: The place that measures 3 to differ with the equal circle that is apart from edge ball. the reading addition that measured at 3 o'clock, divide again with 3, the number of earning is the exterior hardness of pushball namely, the surface that when measuring, should make sclerometer is the same as a ball keeps perpendicular.


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