168 president's address — section h. 



back, in which the refuse is burnt, and which slope down 

 towards the furnace doors at an inchnation of 1 in 3. 

 There are two floors, one on the ground level, the other on a 

 raised platform 1 5 feet above it. The refuse is taken in 

 carts up an incline of 1 in 14, and deposited alongside the 

 destructor, and is shovelled into a row of hoppers at the 

 head of the cells. The i-efuse is dried by the heat reflected 

 from the walls of the furnace, and subsequently burnt to a 

 hard clinker, which is ground into a fine sand and used with 

 lime for mortar. The gases and vapours generated pass along 

 a horizontal flue between the rows of cells, and discharge 

 into a high chimney. Between the cells and the chimney a 

 multitubular boiler is arranged, which generates steam by 

 means of the waste heat, which is used to drive the 

 machinery for grinding the clinkers produced in the furnaces 

 or cells. In some of the latter constructions a small muffle 

 furnace, kept at a temperature of 1500 F. is ai-ranged 

 between the cells and the chimney to complete the combus- 

 tion of the gases generated, and to collect dust and other 

 matters which would otherwise be discharged by the 

 chimney. 



Mr. E. W. Cracknell's garbage destructor consists of a 

 circular drying chamber, in which the material is first intro- 

 duced, which is surrounded by another cylinder forming an 

 annular space, which is filled with water and steam. The 

 cylindrical vessel communicates with a reverberatory furnace 

 arranged immediately under it, into which the dried material 

 is raked, and which is supplied with the gases given off" in 

 the drying process. The garbage is burnt upon the hearth 

 of the reverberatory furnace to a hard clinker. The steam 

 generated by the waste heat in the annular space round the 

 drying chamber is proposed to be used in a variety of ways, 

 for driving machinery, &c. 



In some of the later forms a second furnace is arranged 

 for intercepting paper, dust, &c., which would otherwise be 

 discharged into the main flue leading to the chimney. 



INow, the object aimed at in all Destructors of this class 

 is the continuous destruction of the refuse delivered to them 

 as fast as it is collected, so that the accumulation of all 

 decomposing and offensive matter is avoided. It is also 

 necessary, with a view to prevent the possibility of any 

 offensive smell, or the discharge of any dangerous gases or 

 vapours into the atmosphere, that the gases from the chimney 

 should consist of the completely burnt-out products of com- 



