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Bowler
D-Index
Dutch 200
A score of exactly 200 achieved by the alternation of strikes and spares.
Dynamic imbalance
Measure of weight in an object in motion.
Dynamics
Characteristics of the mass inside of a bowling ball.
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Bowler
E- Index
Equator
Line around the ball, perpendicular to the vertical axis and the midline covering the entire circumference of the ball.
Error
See miss.
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Bowler
F- Index
Finger weight
Imbalance which effectively makes the side of the ball, divided by the midline, containing the finger holes, heavier than the side containing the thumb hole.
Flare
Refers to the bowling ball changing it’s axis of rotation while seeking it’s preferred spin axis during it’s path down the lane. The result is several distinct oil rings being visible around the ball.
Flat ball
See dead ball.
Forward pitch
The drilled hole, either finger or thumb, is angled towards the midline of the grip.
Foul
The act of crossing or contacting the foulline with any part of the body during delivery.
Foulline
The line separating the approach from the lane, usually a black line. This line must not be crossed or contacted during delivery, else resulting in a foul.
Four bagger
Four strikes in a row.
Frame
The ten divisions within a game. The first nine allow two deliveries unless a strike is rolled, while the tenth frame allows a maximum of three deliveries regardless of what is thrown. Also known as box or canto.
Friction
The resistance to motion of two moving objects or surfaces that touch.
Front of hole
Portion of the hole facing toward the center of grip.
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Bowler
F- Index
Full roller
A bowler whose track passes between the thumb and fingers and whose track measures the circumference of the ball.
Full span
Distance from edge of thumb hole nearest to center to edge of finger holes nearest to center, including all inserts and grips.
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Bowler
G-Index
Greek church
This is the 4, 6, 7, 8, 10 or 4, 6, 7, 9, 10 split.
Gripper
See squeezer.
Gutter
The lowered gullies on either side of the lane which force the ball into the pit not allowing them contact with the pins.
Gutter ball
A ball that does not contact any pins because it has been rolled down the lane in the gutter. Zero pins are being counted, even if the ball comes back out of the gutter to hit a pin.
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Bowler
H-Index
Heads
Portion of the lane from the foul line to the range finders (arrows) which are generally located 15 to 18 feet down the lane.
High performance balls
Bowling balls designed to produce specific reactions for different bowlers.
High track
A track outside of the thumb hole and finger holes that is no more than an inch from either.
Hinge angle
Angle at which the thumb is connected to the hand.
Hit the ball
Acceleration of the hand around the ball, from bottom to side, at the release point.
Hook
Amount, measured in boards and angle, that a bowling ball deviates from it’s original trajectory in it’s path down the lane.
Hook angle
Angle at which the bowling ball changes direction at it’s break point.
Hook potential
Degree to which the properties designed into a bowling ball and in it’s potential to traverse towards during it’s path down the lane.
Horizontal axis measurement
Displacement of the center of gravity from the geometric center of a bowling ball.
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Bowler
I-Index
Imbalance
Displacement of the center of gravity from the geometric center of a bowling ball.
Inside line
The portion of the lane bounded by ten boards on each side.
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Bowler
K- Index
Kegler
The german term for a bowler.
Kickback
The dividers between lanes in the pit which often cause previously contacted pins to knock down other pins by providing a backboard to repel them back towards the remaining pins.
Kingpin
Either the first or fifth pin, depending upon which region of the country one is in.
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Bowler
L- Index
Label shift
Displacement of the label from the center of the grip.
Lateral pitches
Right and left components of hole angle in any drilled bowling ball.
Leverage position
In bowling, it is the position at which the bowler is able to use his body to create rotation, speed and momentum on the bowling ball (balanced position).
Leverage weight
A drilling in which the center of the weight block is placed at a 45 degree angle to the axis of rotation of the bowler.
Line
Intended path of the ball down the lane.
Loft
Distance the ball travels before actually making contact with the lane surface after the bowler releases the bowling ball.
Low track
A track outside the finger holes and thumb hole, but more than two inches from either.
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Bowler
M- Index
Mark
A strike or a spare. Also the point on the lane at which the bowler is aiming.
Mass bias
Weight in a particular area of the ball.
Midline
Line that perpendicularly bisects the center line of the grip. A horizontal line halfway between the fingers and thumb.
Midplane
See vertical axis line.
Miss
A failed spare. Also known as blow or error.
Moment of inertia
Amount of force required to spin an object. Mathematically, it is equal to the mass times the distance squared. The further the mass is away from the rotation point the harder it is to rotate (or to slow down for that matter). It is interchangeable with radius of gyration as far as the effect to the ball reaction.
Mule ears
This is the 7,10 split.
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