graduated arc meaning in English
分度圆弧
弧形刻度板
刻度弧
量角器
Examples
- An early instrument for measuring altitude of celestial bodies , consisting of a90 = graduated arc with a movable radius for measuring angles
象限仪用来测量天体纬度的一种早期工具，由一个有90度刻度的圆弧和一个用来测量角度的可移动的半径构成