HOT WATER. 



325 



rally been abandoned, and boilers of various configura- 

 tions have been adopted. Fig. 29 is a langitudinal 

 section, and the following is a transverse section of a 



flued tank boiler, in which the surface exposed to the 

 heat being increased, the effect required is accelerated, 

 and at the same time a considerable saving of fuel is 

 effected. 



, The conical boiler, invented by John Rogers, Esquire, 

 of SeVenoak^, Kent, is formed of two truncated con- 

 centric ones, with a space of two or three inches be- 

 tween them for the water, the furnace being in the inner 

 cone, and the' fuel supplied ft"om the top. 



Mr. Rogers' boiler was originally surrounded with 

 brick-work, but several modifications and improvements 

 of it have -been introduced; in some cases it has been 

 fitted up in a sheet-iron case, like Arnot's stove. In 

 the following figure, the boiler is placed in a cast-iron 

 stand, with ground circular furnace, and register ash- 

 pit doors — a being the furnace, h the boiler, c flow and 

 returning pipes, d the furnace door, c smoke-pipe to 

 the vent, / ash-pit, g. branders, li hole for cleaning the 

 furnace. Tl\e best kinds of fuel for this furnace are 



*28 



