PROCESS OF BAKING. 



plate or damper, , discharges the functions of a chimney, so that 

 the currents of flame and heated air drawn from the furnaces 

 severally entering the oven, circulate around the ware with 



Fig. 41. Fig. 42. 



which it is charged, and rising to the conical roof, H H, escape at 

 the opening t. The current passes from stage to stage through 

 orifices, c, c, c, formed in the flooring for that purpose. 



The great firing which completes the process of baking is 

 maintained for ten or twelve hours. 



The oven is built with fire-bricks, bound by bracings of iron, as 

 represented in fig. 41. In each stage there is provided a door, p, 

 through which the charge and discharge is made, and which 

 during the process of baking is walled up with brickwork. In 



189 



