József Károly Hell
József Károly Hell - 11 March 1789, Selmecbánya ) was a Hungarian mining engineer and inventor, who invented the water-pillar in 1749. It is mainly used today for oil extraction. He also proposed construction of the tajchy reservoirs around Selmecbánya. He was a student of Sámuel Mikoviny in 1737. Regardless of his nationality, he is a pride of both Hungarian and Slovak nations.
His first machine was able to pump water up from the depth of 212 meters. Jozef Karol Hell later built the pumping machines in 1749-1768, which belongs to the best technology in this field worldwide.
