HEATING BY HOT- WATER PIPES. 



181 



structed of upright tubes placed over 

 the fire, and united together at top and 

 bottom. The furnace bars are hollow 

 tubes through which the return-water 

 passes before entering the upper part 

 of the boiler, thereby causing a very 

 rapid circulation, and being said to pro- 

 duce double the effect from the same 

 quantity of fuel. 



This highly respectable firm have also 

 recently brought into notice another form 

 of boiler, which they call the saddle- 

 shaped pipe-boiler, with hollow furnace 



Fig. 235. 



bars; a representation of it is given in the 

 annexed cut. They very properly assert 

 that such tubular boilers are not only 

 powerful in their effects, but also that 

 this power of heating is attained with 

 a considerable economy in fuel, while the 

 house to be acted upon, is heated with 

 greater rapidity than by any boiler of a 

 different construction. Fig. 235 shows 

 the plan, and fig. 236 the section. 



Fig. 236. 



Ker slakes universal flue holler. — We have 

 here a most effective and fuel-saving 

 boiler, as all those are where so great a 

 portion of surface is brought into imme- 

 diate contact with the heating material. 

 The longitudinal section, fig. 237, shows 

 its principle. From the back of the fire- 

 place the flues are connected within the 

 boiler, so that very little heat can escape 

 before traversing the interior of the boiler 

 three times, then around a flue at the sides 



before ascending the chimney, thus mak- 

 ing it both effective and economical in 



Fig. 237. 1 } Q co f um P" 



tion oi fuel 



to very great 

 extent. These 

 boilers have 

 been extensive- 

 ly used in the 

 neighbourhood 

 of Exeter, in 

 which city they 

 are manufac- 

 tured either 

 in cast or 

 wrought iron, 

 and they are 

 highly recommended by Mr Barnes and 

 other gardeners of eminence who have 

 them in operation. 



The Captain boiler — fig. 238. — Under 

 this rather singular appellation an anony- 



Fig. 238. 











< 













n r n 



mous correspondent has communicated 

 the following details of its merits to the 

 editor of " The Gardeners' Chronicle." 

 After pointing out some of the defects of 

 the present modes of heating, he proceeds : 

 " The following is a plan of a boiler in- 

 tended purposely to remedy some of these 

 defects. Every particle of fuel burnt in 

 it must give a return to the owner." 



" I think," he says, " the Captain will 

 do a tenth more work than any boiler yet 

 in use, or the same work at a tenth less 

 cost of fuel. It differs from all others 

 now in use, not only in shape, but in 

 principle." The following are the dimen- 

 sions of its parts : " These, of course, can 

 be enlarged or diminished to suit any size 

 or range of buildings : a a is an opening 



