And in recent years with the popularity of electronic technology, electronic measuring Angle has gradually replaced the optical measuring Angle.
而近年来随着电子技术的普及，电子式已经逐步取代了光学式测角技术。
A New Method for Measuring the Rifling Angle of Artillery Pipe Based on Template Matching.
基于模板匹配的火炮身管膛线缠角测量技术研究。
In this paper calculating method of lead angle of helical gear by measuring span length of length bar and base tangent length is put forward and lead angle calculating formula is deducel.
分析齿轮主要参数，提出用测量跨棒（）和公法线长度计算斜齿圆柱齿轮螺旋角的测绘方法，并推导出螺旋角的计算公式。
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