[2] It was part of his development of the kitchen range, which gave more control of the cooking and saved fuel.
[4] The Rumford roaster is a cylinder of cast-iron set into a brick wall.
It is heated by a separate firebox below, and the ashes fall into a lower box.
[5][6] Rumford's invention distributed heat evenly around the food.
[5] The Rumford roaster was ultimately made obsolete by improvements in cast-iron technology.