instrument weather
2.In order to adapt to the observational condition of magnetic declination and inclination with the high resolution and precision magnetograph,the azimuths among 7 measurement platforms and 4 azimuth marks in reconstructed Jinghai station,Seismological Bereau of Tianjing,are precisely measured by using classical astro?geodetic method,and 38 parameters with average error ±1.2″are gained. After the measurements, 7 sets of instrument can be used at same time in all?weather. ?
