Harvested coffee beans are roasted to bring out the flavor. The first American coffee roaster patent was granted in 1833 and the next in 1840, followed by about seventy-five more during the next thirty years, all of sheet metal or cast iron. Roasters were of two basic types: revolving drums with a side crank or stirring pans with a lid crank. All had stirring wings or fingers to agitate the berries constantly. Most roasters were used atop ranges, but one from 1866 was a cast-iron, round-bottom “kettle” with three peg legs and a crank in the lid, set over coals or hearth embers. A few were portable and came mounted on their own little stoves.