Before revision: Cast iron Wrought iron grille in St Petersburg Cast iron is produced in a furnace stoked with alternate layers of coking iron then poured into molds.
After revision: Cast iron alt=A rectangular area of about 3 by 7 meters with gravestones fenced in with an cast iron railing about a meter high Cast iron is produced in a furnace stoked with alternate layers of coking iron then poured into molds.