174 HOT WATER AND STEAM. 



time, made either powerful or weak as the tempe- 

 rature of the house may require. 



The manner the flues have been directed to 

 be erected in the different hothouses, may serve 

 greatly as a guide for placing the pipes for hot 

 water heating, they should be placed along 

 such parts of the house, (particularly along 

 next the front classes,) where the greatest heat 

 is required to resist vigorous frost and severe 

 cold weather ; and if a sufficient quantity of 

 pipe be allowed, the temperature may be raised 

 to any necessary height required at any season 

 of the year. I scarcely need remark, that 

 water will always find its level, therefore, when 

 a pipe with returns is placed in the house, the 

 return or returns can be carried, either one over 

 the other from the same, or run parallel, side 

 by side horizontally, and be thus conveyed 

 round the house. 



The fire-place for the boiler may be con- 

 structed at one end, with one pipe fixed in the 

 boiler, which will act as a funnel to the whole of 

 the pipe, with its returns, and cause the pipes 

 to be continually charged, by having the boiler 



