Mechanical bank:Dark Town Battery

Cast-iron mechanical banks, a uniquely American invention, represent a perfect combination of readily available materials, low-cost labor, mass-production processes, and ingenious toy design. After the American Civil War ended in the 1860s, cast-iron foundries turned to the production of peace-time goods. Many manufactured cast-iron toys as a sideline to making shovels, rakes, stoves, tools, and other consumer products. Adding a mechanical action to savings banks encouraged children (eager to see the banks' motions again and again) to save more of their coins (or so their parents hoped).