C Calipers are used to measure diameters or thicknesses of parts with greater ease and accuracy than can be done with the steel Several types of these instruments are The simple caliper has two legs which can be adjusted to the size of a workpiece，which is then measured with a steel See F There are separate types for inside and outside diameter Slide calipers are a refinement of the steel rule，which insures greater accuracy in aligning the graduated scale with the edges or points to be They are useful in rough measures of diameters，thicknesses，and The Vernier caliper，invented by the sixteenth century，French mathematician，Pierre Vernier，consists basically of a stationary bar and a movable slide The stationary rule is a graduated bar with a fixed measuring jaw，The movable Vernier slide assembly combines a movable jaw，Vernier plate，clamp screws，and adjusting 卡钳。使用卡尺测量直径或厚度的部分缓解和准确性比可以用钢尺。几种类型的使用这些工具。简单的卡尺有两条腿，可以调整大小的工件，然后用钢尺测量。看到F1。有不同类型的内部和外部直径的措施。游标卡尺是一个精致的钢尺，确保更大的准确性在调整边缘点的刻度尺测量。他们是有用的在粗略估算的直径，厚度和孔。游标卡尺，发明的16世纪，法国数学家，皮埃尔游标，基本上由一个固定酒吧和一个可移动的滑动总成。固定的规则是毕业条固定测量下巴，移动游标滑大会结合了移动下巴，游标板、夹螺丝，调节螺母。
