A brick oven about 5ft. by 4ft. by 4ft., conforming to the sketches below, may be built of fire-bricks, with walls Gin. to 9 in. thick, puddled with fireclay and covered either with stone slabs or with a corrugated iron sheet. If stone slabs are used, then two openings must be cut to serve as chimneys for the escape of steam and hot gases. One end of the kiln should be left open for charging purposes, and a temporary wall may be built before firing and removed again after the bricks are burnt. Iron tie-rods should be used to keep the kiln in shape. There are four fire-holes in the kiln, two on each side; the firebars are fitted at the Level of the ground, the ash-pits being below the ground level, and the ground must be excavated along each side of the kiln so as to reach the ash-pits. The firebars are placed at the level of the ground so as to get efficient heat at the bottom of the kiln, and the bricks must be so set in the kiln that they tend to carry the flames to the centre of the kiln as well as up the sides.

How To Build a Small Brick Kiln.