Job printers used a variety of printing surfaces and types (metal and wood) to create ephemera such as calling cards, advertisements, bookplates, and posters. After the introduction of the iron printing press about 1800 and steam power in the 1850s, the physical effort expended on the earlier wooden handpresses was converted into larger print runs. Certain printing plates, like electrotypes, developed in tandem with such technological advancements. The electrotype, perfected in 1844, transformed the printing potential of wood engravings already improved by the pantograph (tracing device) and milling router (cutting device). In essence a metal facsimile created through a galvanic process of the engraving block, an electrotype could withstand a print run up to 75,000 in number.