Cave and Geological Research

Images showcasing geological features and historical cave documentation including petroglyphs and cave photography.

A Bessemer steel converter removed impurities from iron by oxidation (burning) with high-pressure air being blown through the molten iron. The sparks flying from the crucible are the oxidized impurities, such as silicon, manganese, and carbon. 1889.
A Bessemer steel converter removed impurities from iron by oxidation (burning) with high-pressure air being blown through the molten iron. The sparks flying from the crucible are the oxidized impurities, such as silicon, manganese, and carbon. 1889.