1G 



FAKM BUILDINGS IN SOUTH AFBICA 



" corbelling " the bricks, i.e. by allowing each, brick to project slightly 

 beyond the brick immediately below it. This projection should not 

 exceed 2 inches at a time. 



Instead of being formed as large as shown in the figure, these fire-places 

 are sometimes made much smaller and receptacles for fuel are built up, 

 with a few bricks, outside the clamp. Only part of the kindling fuel 

 then occupies the now reduced fireplace F, the bulk of it being in the 

 outer receptacle, built in front of F. These outer receptacles should be 

 covered in on top by a piece of sheet-iron, or a flat stone, so as to drive 

 the flames from the kindling-fire into the clamp. 



If sufficient old burnt bricks are available it is advantageous to build 



Fig. 8. — Clamp for coal firing. 



up the four sides of the clamp with a 3-inch skin of these built on edge. 

 Bricks from a previous clamp, which have been spoiled in the burning, 

 may be used for this purpose. 



The outside of the clamp, with the exception of the top, is now 

 thoroughly plastered with clay or dagga, and the kindling-fires are laid 

 and ignited. 



When it is evident that the fuel in the clamp is well alight and 

 burning briskly, the ends of the kindling fireplaces are bricked up 

 almost completely, and plastered with dagga, and the top of the clamp 

 is covered with a layer of ashes. In this way combustion is prevented 

 from being too rapid. Sufficient air finds its way into the clamp through 

 the small orifices left at the kindling fireplaces, and through cracks 



