46 



Professor W. A. Bone 



[Feb. 27, 



so uniquely combined in the new system that the resultant heating 

 effect is, for many important purposes not only pre-eminently 

 economical, but also easy of control. 



Diaphragm Heating and its Applications. 



In the first process the homoa'eneous mixture of a'as and 



an- IS 



allowed to flow under slight pressure through a porous diaphragm of 

 refractory material from a suitable feeding chamber (see Fig. 3), 



Fig. 



-Diaphragm, Sectional View. 



and is caused to burn without flame at the surface of exit, which is 

 thereby maintained in a state of red-hot incandescence. The dia- 

 phragm is composed of granules of firebrick, or other material, 

 bound together into a coherent block by suitable means ; the 

 porosity of the diaphragm is graded to suit the particular kind of 

 gas for which it is to be used. The diaphragm is mounted in a 

 suitable casing, the space enclosed between the back of the casing 



