校正曲线法 calibration curve method ; CCM

绳正法整正曲线 string lining of curve

正锤线法 method of right plummet observation ; direct plummet observation

划线更正法 correction by drawing a straight ling ; correction by drawing

又称校正曲线法 calibration curve method

张线式曲线校正法 Versine inspection of curve

正切定理和法线 Tangents and Normals