A steam double bottom kettle either having a ball in the center or else a winding pipe. In this same shaped pot all systems can be employed. The one shown on the figure has a double jacket; on top place a ring and in this a tinned basin; fill it half full of boiling water and use it for cooking ices; stocks, broths and consommes are cooked in those having a ball in the center, or else a winding pipe, but the ball is preferable. For cooking potatoes, lobsters, terrapin, etc., iron pots with rounded corners are used; on the bottom is an iron winding pipe furnished with holes: at the bottom is a hole for letting the water from the condensed stream run out, on top a hinged cover sufficiently heavy to close it hermetically, specially required for these kinds of pots.