Masonry oven these primitive-looking ovens were still being produced in Barnstaple potteries as late as 1890". A cloche or cooking bell is like an upside-down, fired ceramic bowl with a handle on top. It is heated in the fire along with a flat rock or open spot on the hearth. The prepared dough is placed on the hot rock or hearth floor, and then covered with the cloche, and perhaps hot coals or ashes for additional heat. The method goes back to ancient Egypt and Greece, and was probably the first form of masonry oven. It is possible to get some of
Kenya Ceramic Jiko remain slightly porous when temperatures reach 1150 °C; the clay should not warp or change shape when fired at 1250 °C. When the clay is fired up, it should turn to a light pink to white colour, and, to reduce the likelihood of cracking, it should shrink less than 8% after being fired. Clay which meets all the above standards is generally referred to as a "fireclay". To produce the Kenya Ceramic Jiko, two types of skilled labour are needed, a metalworker, and a clay worker. Other than a hammer, all other tools needed to manufacture the Kenya Ceramic Jiko