..."The first lightning current measurement were made by Pockels (1897, 1898, 1900) in Germany. He analysed the residual magnetic field induced in basalt by nearby lightning current and by doing so was able to estimate the values of those currents"...
... "Kwanza umeme kipimo sasa yalifanywa na Pockels (1897, 1898, 1900) katika Ujerumani. Yeye kuchambuliwa mabaki magnetic shamba ikiwa katika basalt na radi jirani ya sasa na kwa kufanya hivyo alikuwa uweza na makisio ya maadili Wale mikondo"...