National Geographic : 1939 Sep
Photograph by A.Aubrey Bodine "HELLZ A POPPIN' " OVER THE BETHLEHEM STEEL PLANT AT SPARROWS POINT Into this blast furnace on the Patapsco River below Baltimore is poured iron ore, coke, and flux (a mixture of limestone and dolomite). Resultant steel may go into nails, refrigerators, automobiles, or streamlined trains. Steel for San Francisco's Golden Gate Bridge was rolled here. By-products ofthe furnace include cooking gas, coal tar, cement, fertilizer, and road-building materials. Nightly glow of hot slag from the furnaces points theway toBaltimore for sailors far out on the Bay.