HAMBURG 



Tin- necessary amount | air for combustion is fur- 

 nished by two electrically-driven blowers which act 

 under ;i pressure of about 40 to 50 mm. of 



Management 



water column. The air enters directly over of Draught in 

 the clinker doors of the furnaces and com- 

 municates with a common suction pipe so that smoke 

 and dust are carried away at this point. The air is 

 somewhat warmed before it reaches the fire. The 

 quantity of air can be regulated through valves placed 

 in front of each furnace. Electric bells communicate 

 and afford opportunities for signalling between the 

 stokers and the men who feed the refuse into the 

 hoppers. 



The exhaust products of combustion and fumes from 

 the drying hearth enter a second chamber over the 

 furnace arch. The walls of this chamber are Exhaus 

 kept at a temperature between 500 and 100 C. J c 

 Here the imperfectly burned gases and fumes Refuse 

 are consumed by the red-hot walls, so that an escape 

 of odors into the atmosphere is avoided. 



The inoffensive gases finally pass through horizontal 

 and then vertical flues fixed between the furnaces 

 which carry them to a central chimney 160 feet high. 

 The fine dust and ashes which are carried out of the 

 furnaces lodge in the main flue and final combustion 

 chamber from which they are removed from time to 

 time. The combustion chamber is usually cleaned at 

 intervals of about three days and the flues about every 

 three months. 



The ashes and clinker left in the main part of the 

 furnace after the refuse is burned, consisting of about 

 59 per cent of the weight of the original refuse, is with- 

 drawn in specially designed tipping wagons. A slight 



131 



