Most of the switch tubes used presently work in the gas spark region (the right branch of Paschen curve), and are made of graphite and mental such as tungsten, molybdenum, stainless steel and mercury.
The paper introduces the concept of curve following turnout branch line, the confirmation of head and end, the chord offset calculation of points, the measuring steps in the field.
文章介绍了道岔附带曲线的概念及头尾的确定，各各点支距的计算和现场测设步骤，并确定了拨道整正方法。
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Bezier curve is a good curve fitting tool with preferable interactive performance, which ADAPTS to construct branch and trunk of trees.