The casting shed (trochford) Tags: iron ironworks factory blastfurnace pigiron castiron saugusironworks saugus saugusma saugusmassachusetts massachusetts newengland usa historic nationalhistoricsite 1600s 1646 17thcentury colonial bw bnw blackandwhite blackwhite noiretblanc blancoynegro mono monochrome canon ef24105mmf4lisusm indoor