He discovered that iron castings which were too hard to be worked could be softened by packing them into iron ore or hammer slag and exposing them to high temperature for a number of days.
U kume leswaku ku virisa masi eka mahiselo yale henhla kutana ya hatlisa ya horisiw loko yangase cheriwa e bodlheleni kumbe eka xibye xin'wana swiendla leswaku yatshama yari furexe kuringana nkarhi woleha.