302 



THE FRUIT GARDEN 



modifications of it more or less of an improvement. There has been a keen 

 controversy for some time regarding the best steam boiler for marine and naval 

 purposes, the old cylindrical or Scotch boiler being largely replaced by some 

 form of water-tube boiler. In a recent trial in two ships of war, one having 

 the cylindrical, the other the Belleville water-tube boiler, it was found that what- 

 ever advantage the latter might have for use in a fighting machine, neither in 

 economy nor efficiency was there much, if any, advantage over the old type. 

 On land the Cornish and Lancashire boilers still hold their own as economical 

 steam generators. 



It is thus evident that the horizontal boiler and furnace are still in favour. 



Fig. 



-Ordinary Plain Saddle 

 Boiler 



Fig. 12.- 



-The Terminal Saddle 

 Boiler 



The hot- water saddle boiler may be said to represent the upper portion of the 



cylindrical boiler, and made of ample size is most suitable for horticultural work. 

 Fig. 1 1 shows the ordinary plain saddle, very suitable, when favourably 



placed, for 600 or 800 feet of 4 inch pipes. 



When the apparatus is from 800 to 2000 feet the terminal saddle. Fig. 12, 



should be used, because it occupies 

 less space than the length of the 

 plain saddle would require. 



For still larger apparatus up to 

 10,000 or 15,000 feet of 4-inch 

 pipes a steel riveted modified 

 Cornish boiler is certainly the 

 best. Fig. 13 shows such a 

 boiler. The writer has used one 

 of this shape, 21 feet long, 4I 

 feet diameter, with water bars, to 

 heat 15,000 feet of 4-inch pipes, 



with the very best results. Of course where valuable plants are at stake it is 



not desirable to depend upon one boiler ; there should be a duplicate in case of 



a breakdown. 



It is unnecessary to refer to the army of small independent upright boilers 



of all "shapes and sizes" which are on the market. These may do their 



Fig. 13. — Steel Riveted Modified Cornish Boiler 



