The Chinese also launched weather balloons near their theodolites to measure atmospheric temperature and pressure changes to better estimate refraction errors.
中国还在经纬仪附近发射了气象气球来测量大气温度和压力变化，以更好地估计折射误差。
2
Geodetic theodolites generally have circles of about 140mm diameter.
大地经纬仪的度盘直径一般为140毫米。
3
Dynamic Angle measuring system has been employed in electronic theodolites.