invented by John Rogers, Jim., Esq. 



133 



front is intended solely to remove 

 clinkers which may form, or fuel 

 when the fire is extinguished ; at 

 other times it is closed with a fire- 

 brick plug, and should never be 

 opened except when absolutely neces- 

 sary. My original boiler had no such 

 opening, and was fitted with a revolv- 

 ing grate, which overturned to empty 

 the furnace; but various inconve- 

 niences, and the frequent breaking of 

 the pivots on which the gratings 

 swung, have led me, somewhat un- 

 willingly, to adopt the present alter- 

 native. 



For a side view of the boiler 

 see ^g. 26., where it is represented 



as attached to a range of pipe. J" and r are the flow and return 

 pipes, and d a flange for examining and cleansing the boiler 

 when necessary. Into this flange is fixed a small pipe, which, 

 being connected upwards with the supply cistern e, and down- 

 wards with the cock or tap h, serves to fill and empty the appa- 

 ratus. The supply cistern {e) acts also as an expansion cistern, 

 to receive the volume of water increased by heat. 



Fig. 24. shows the most convenient mode of setting the above, 

 exhibited by a front view. A solid base being built with an 



24 



aperture in its centre open to the front, as high as the desired 

 depth of the ash-pit, the boiler is fixed upon it, and the brick- 

 work carried up to its lower flange or rim. The side walls should 

 then be raised, in 4-inch work, level with the top of the boiler, as 

 represented in Jig. 24. a is the ash-pit; b the boiler; c the 

 aperture in front of the boiler, closed with fire-brick; ee and dd 



