peared, the " grand feu " begins, which is the period of baking. The fuel used is wood, peat, coal or coke, according to locality. The coal should be of a kind giving a long flame; its use exposes the products more easily to sudden outbursts of heat than wood, the heat of which is always uniform ;… … Fig. 204. — Longitudinal Section. Eig. 205. — Transverse Section. (Scale of I centimetre to the metre. ) channel opening into the chimney. Registers are placed in each channel, so that the fire can be pushed at points where firing is progressing less quickly. Openings in the vault permit of the…