| 摘要 |
An improved form of bowling calculator which allows for interposition of either of two covers upon a main frame that carries bowling lane indicia. Each of the interchangeable covers includes an elastic member extending longitudinally within the cover with a plurality of adjustment means spaced along its length. Each cover is freely positionable upon the main frame by an access opening which fits over a registration pin extending upwardly from the surface of the main frame. With this improved device, a characteristic ball curvature may be defined for each of two distinct bowling lanes by individual adjustments of the elastic member within each of the covers, thereafter each cover may be interchanged upon the main frame as two bowling lanes are being used, for example as in tournament play. The present device allows the bowler to determine lane spots for each of two separate alleys, and adjust the elastic member on each of two covers so that he may more accurately determine a spot for each of two bowling lanes by reference to the habitual curvature the bowler has discovered for each of two bowling lanes.
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