| 摘要 |
An apparatus for determining whether an approximately circular opening falls within predetermined dimensions. A flexible circular gauge comprises two resilient cylinders, one partially encased inside the other. The outer diameter of the smaller cylinder equals the minimum designed diameter of the opening. The thickness of the outer cylinder is equal to one-half the predetermined tolerance in variation in the dimensions of the opening, and the entire gauge is sufficiently flexible to follow the inside walls of the opening even though they may depart from a precise circle.
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