EXPERIMENT STATION BULLETINS. 



193 



(Fig. 15. — Section of Furman Steam Heater.) 



Fig. 15 shows a section of the boiler as originally made. Those sent us 

 differ in one or two details as will be pointed out. 



The cast iron base is circular and forms the ash jjan. It has a large ash 

 door and a damper door with which the automatic draft regulator is con- 

 nected by a chain. The grate is of a fingered rocking pattern, worked 

 from the outside by a long handled lever (Fig. 14). The sides of the 

 fire box are formed by a row of flattened drop tubes, one foot \ix circum- 

 ference and 26 inches long (Figs. 15 and 16). One of these tubes is 

 shown in Fig. 17; they have a partition through their center and are 

 screwed into the cast iron top of heater. Our heaters are of the magazine 

 pattern like Figs. 15 and 18. The surface burners have no magazine and 

 contain a row of short drop tubes directly over the fire, (Fig. 16). 



25 



