196 MASSACHUSETTS HORTICULTURAL SOCIETY. 



Discussion. 



E. "W. Wood was called on b}' the President, and said that he was 

 onl}' a learner, and had never seen a heating apparatus of the kind 

 described in operation. If we can get a more rapid circulation, and 

 less fire will keep it up, that is an advantage ; but at present he 

 goes to bed with more confidence than if he had only two-inch pipes 

 in his greenhouse Nothing retains heat better than water. He 

 replenishes his fire at three P.M., and banks it at seven. A cold 

 windy night like the last night makes it very difficult to keep a 

 proper temperature in the greenhouse. He would rather have it 

 10° below zero and still, than 15° above and windy. He does not 

 think so much heat is lost up the chimney as he formerlj- did ; it 

 does not amount to much except while the draught is open to start 

 the fire. A neighbor who thought, from his chimney' being so hot, 

 that a great deal of heat was lost through it, ran it up the length 

 of a house on a side hill ; and although veiy hot while he was mak- 

 ing the fire, shortly afterwards it was nearlj^ as cold as if there had 

 been no fire in it. 



James Cartwright had known a boiler tried with a brick partition, 

 as recommended by the essayist, which was afterwards taken out 

 and a plate of iron was inserted, so placed as to avoid a downward 

 draught, and it did better. He would prefer to have a dividing 

 partition horizontal rather than vertical, as his experience had 

 shown that it would work better ; and it is better not to have a flue 

 dip downwards. He thought a boiler built of pipes, as recommended 

 by the essayist, should have them connected at both ends b}- means 

 of a box or drum, instead of b}' returning bends in the pipe, which 

 would make too much friction and obstruct circulation through the 

 boiler, so that there would be danger of the pipes being cold in 

 the morning. He thought a boiler built on the plan recommended 

 should be from eight to twelve feet long : five feet would be too 

 short. The stand-pipe was correctly placed near the boiler ; when 

 too remote the boiler will sometimes make steam and throw the 

 water out of the stand-pipe, and then when the steam subsides the 

 pipes will not be full and the circulation will stop. His son (Mr. 

 George Cartwright, who was mentioned b}' the essayist) has his 

 flow-pipe dropping to the end of the house, and the return-pipe 

 dropping also ; and he uses less fuel than with large pipes. The 

 return-pipe is hot enough in the morning to burn your hand. If 

 you get water very hot, with bell joints there is danger of their 



