234 



Commercial Gardening 



Fig. 176. Stevens' Improved Cornish Boiler 



the front. In the Cornish or Trentham boiler a large water space is 

 exposed to the fire, and as the heat has most force on the upper side, 

 where there is less likelihood of matter accumulating, there is an excellent 

 circulation of hot water through the flow into the pipes in the houses. 

 Sectional Boilers.^Of late years these have attracted some attention 



among market growers, and many 

 are now using them. The chief 

 advantages appear to be that a 

 boiler can be added to if neces- 

 sary if more work is required 

 from it. Each section is indepen- 

 dent and can be bolted on to the 

 others or taken awa}^. They are 

 considered to be very economical 

 in fuel, they are easy to stoke and 

 keep clean, and the cost of brick- 

 work is saved in the setting'- 



O 



Being made of cast iron they are less liable to rust than the wrought- 

 iron boilers are when fixed in a damp stokehole; and in the case of a 

 section giving way, it can be easily replaced instead of the whole boi lei- 

 being rendered useless as would be the case with a wrought-iron boiler. 

 There are several kinds of sectional boilers now on the market, one 



of the best known being the 

 "Robin Hood "of Messrs. Foster 

 & Pearson (fig. 177), of which 

 there are several patterns. 

 Other makes are the " Mona " 

 and " Anglian ". The illustra- 

 tion (fig. 178) shows a type 

 having a Sylphon automatic 

 regulator by means of which 

 the draught can be regulated. 

 Automatic regulators, how- 

 ever, are not recommended 

 for damp stokeholes, as the 

 rust soon causes the working- 

 parts to be out of repair. 



Setting" Boilers. Gene- 

 rally speaking it will not 

 pay a nurseryman or market 

 grower either to set his own 

 boilers or pipes or to build his 

 own greenhouses. That is work best done by horticultural builders who 

 make a speciality of it. And yet many growers take a pride in being 

 able to build their own glasshouses, and to set their own boilers and 

 pipes. Then they can blame nobody else if anything goes wrong. The 



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Fig. 177. Sectional "Robin Hood" Boiler 



