| 摘要 |
A tool for measuring an object having a circularly curved surface provides a generally rectilinear body defining a V notch having two converging sides meeting at an apex and an angulated wedge track. A wedge movable along the wedge track and across the V notch intersects a bisector of the V notch at an angle other than perpendicular. Sides of the V notch and a measuring edge of the wedge simultaneously contact the circular curve at three equally spaced apart positions along the circumference of the circular curve. Measuring indicia on the body adjacent the wedge track allows determination of the lateral movement of the wedge along the wedge track. The distance the wedge moves on the wedge track is equal to the radius of the circular curve.
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