BOILERS FOR HEATING. 



251 



full-length flow pipe round the fronts and sides of the house ought to have a trough for 

 water, these evaporating troughs, if kept filled as required, proving of considerable 

 assistance in maintaining a moist atmosphere. 



Boilees. 



Of whatever form these may be they ought to be large enough for heating the 

 amount of piping attached to them without the necessity for hard firing, as this is wasteful 

 of fuel ; and yet they must not be too large 

 or powerful, as this extreme is the reverse of 

 economical. Small boilers may be of cast 

 iron, but for hard work those formed of 

 wrought iron are preferred as being the 

 more reliable. Boilers of the saddle type are, 

 as a rule, the more favoured, as they do not 

 require deep stokeholes with expensive drains 



Fig. 116. The Chatsworth. Boiler. 



to prevent flooding, and since the introduction 



of saddle boilers with water-way backs, check ends and flues, their heating power is 

 very great. The Chatsworth Boiler, Fig. 116, has fully equalled the expectations formed 

 of its heating capacity. It is made in various sizes to heat from 500 to 2,000 feet of 

 piping. The largest size is not more than 84 inches long by 32 inches high, and this 

 is capable of heating 2,350 feet of 4-inch piping. Boilers of this type require no 

 great amount of skilled attention, and because of the length through which the smoke 



has to travel before it reaches the chimney, there is 

 very little waste of heat. Much that has been ad- 

 vanced concerning the Chatsworth also applies to the 

 three-flued Express or Gold Medal Boiler, of which 

 many are doing good work in various parts of the 

 country. In this instance moderately tall chimneys 



Fig. 117. The Delta Boilee. j j j 



are required, or the draught may not be equal to taking 

 the heated gases through the extra length of flues before reaching the chimney. In 

 any case the flues of boilers ought to be well cleaned out once a week. 



The Delta, shown in Fig. 117, is constructed for very shallow stokeholes, or where 

 it is not possible to form a deep drain for keeping them dry. One of these saddle 

 boilers, capable of heating 1,000 feet of 4-inch piping, measures 48 inches long, 



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