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Conceptual diagram of bowling ball cores. Conversion (convert): In the second ball roll of a frame, the knocking down of all pins that remained standing after the first roll, so as to achieve a spare for that frame. Term is often preceded by the number(s) of the pins involved (example: "3–6–10 conversion").
The 1:12 scale is a traditional scale (ratio) for models and miniatures. In this scale (ratio), one inch on the scale model or miniature is equal to twelve inches on the original object being copied. Depending on the application, this particular scale (ratio) is also called one-scale (since 1 inch equals 1 foot). [1]
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The USBC and World Bowling promulgate bowling ball specifications. USBC specifications include physical requirements for weight (≤16 pounds (7.3 kg)), diameter (8.500 inches (21.59 cm)—8.595 inches (21.83 cm)), surface hardness, surface roughness, hole drilling limitations (example: a single balance hole including the thumb hole for "two-handed" bowlers [3]), balance, plug limitations, and ...
Maurice Louis Pinel Jr (1942 – March 5, 2021) was an American mechanical engineer, product designer and bowler.He is known for changing the game of ten-pin bowling with his innovative bowling ball designs, notably using asymmetric core masses which allowed the ball to curve more aggressively in its path down the lane.
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True scale diagram: A straight path, even one starting from the extreme outside corner of the lane, results in an angle of entry of at most 1.45°. Larger entry angles (shown in diagram) are achievable when hooking (curving) the ball. Larger entry angles have been shown to be generally more favorable for achieving strikes. [9] [10]
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