A tri-axial square Helmholtz coil system for the study of palaeomagnetic studies. manufactured by GEOFYZIKA (former Czechoslovakia). was successfully commissioned at the Alibag Magnetic Observatory (IAGA code: ABG) in the year 1985. This system was used for a few years. https://www.chiggate.com/loving-earth-jilungin-dreaming-tea-30g-cheap/