Cambria Iron Works, Johnstown, Pennsylvania, Blast furnaces Nos.1,2,3 &4 converted from lifting elevator charging buggie systen to tramways with platform carriers for the hand operated charging buggies.
Detail of Cambria Iron Works, Johnstown, Pennsylvania, Blast furnaces Nos.1,2,3 &4 converted from lifting elevator charging buggie systen to tramways with platform carriers for the hand operated charging buggies.
Pittsburgh, Pennsylvania Rolling Mill' with puddling furnaces and sqeezer. Puddling furnaces to the right, sqeezer in the middle and hand operated rolling mill to the left
Faint outline sketch of building with plants, garden arch, trees. Written caption: "This sketch has by tradition been identified as the 19th century greenhouse at Eleutherian Mills. A pencil notation on the back of the sketch identifies it as the...
