18 



THE AMATEUR S GEEENHOUSE 



of boiler is the small space it occupies, and another advantage 

 is that it can be so arranged as to continue burning many 

 hours without attention, a most important matter in a garden 

 wliere labour is not largely employed. One of the best forms 

 of the conical boiler is that manufactured by the Thames Bank 

 Iron Company, Upper Ground Street, London. 



The most generally useful boiler, whether for heating one 

 house or a range of houses, is the Saddle, of which there are 

 many forms, but all of them are variations of an arch or 

 saddle, the interior of which is appropriated to the fire, while 

 the exterior contains the water. The horizontal court^e of the 

 draught moderates its force, and tends rather in the direction 

 of slow than of fast combustion ; but the saddle is not to be 

 regarded as a " slow combustion" boiler, in the proper sense 

 of that term ; it is simply not rapid, and hence does not re- 

 quire frequent attention. The great power of these boilers, 

 and the fact that — to use a gardener's phrase — they will " burn 

 anything," are their two principal merits, but it must be 

 added that they do not require to be set any great depth 

 below the course of the pipes, and they are remarkaby econo- 

 mical in respect of consumption of fuel, in consequence of 

 slow but perfect combustion. Amongst the best forms of 

 saddle boilers mention may properly be made of the Cannon, 

 which is cylindrical ; the Flat Saddle of the Thames Bank Iron 

 Company ; the Terminal, made by Mr. Jones, of David Street, 



•JONES'S DOtTBlE L SADDIE-BOILEE. 



Manchester ; and the Double L, made by Messrs. Jones and 

 Son, of 6, Bankside, London. 



If a final choice is to be made amongst these, we shall vote 



