What this step adds; in part B, the heat and the conesParts already in placeAn updraft kiln 1.8 × 1.6 m, in 215 × 102.5 × 65 mm bricks. Fire in two tunnels under a perforated floor; the hot gas rises through the setting and leaves by the chimney. Bricks fire at 900–1,000 °C and earthenware at 1,000–1,200 °C, so this firing tops out at 1,000 °C. The schedule is the model's assumption: 6 hours of slow water-smoking to 200 °C, a climb of 100 °C an hour, a one-hour soak, then natural cooling with every opening shut, below 100 °C after about 35 hours. The four cones are chosen to bend at 900, 950, 1,000, 1,050 °C; the model bends each one from the hottest moment so far, starting 30 °C below its rating, though real cones answer to time as well as temperature. Glow starts near 525 °C; its colours are the usual eye estimates. This is a guide to how the parts go together, not engineering drawings. A kiln at 1,000 °C burns on contact and its stoke holes throw flame: build it outdoors, well clear of buildings and anything that burns, wear leather gloves and eye protection at the stoke holes and spy hole, and never open it hot.

Pottery and brick kiln, build and run — FIG. 01 · POTTERY AND BRICK KILN