ON HEATING A GREENHOUSE BY MEANS OF HOT WATER, &C. 255 



inches by 7 £ inches, and 4 inches deep ; surrounded on three sides 

 by a boiler half an inch in diameter, which becomes more spacious 

 upwards as the fire-place diminishes. The opening necessary for 

 the reception of the fire-pan and for supplying it with fuel is 8 inches 

 wide by 6 inches deep. At the top of this opening the fire-place 

 commences tapering ; consequently the water in the boiler expands 

 more immediately over the fire, the smoke-pipe takes its regular 

 width (ll inch in the boiler) about an inch below where the lid 

 unites. The horizontal water pipes are each 33 inches long by 

 2^ inches in diameter; the end pipes are 15f inches high by 3 

 inches in diameter ; a feeder is added, in case it should be thought 

 better to have the lid fixed tight on the boiler. In order to promote 

 the circulation of the water, small holes are to be perforated in the 

 top of the lids, which are also intended to be fixed tight. The 

 apparatus may either be placed on the floor of the place to be warmed, 

 or raised by bearers, or suspended by wire or cord ; the two latter 

 methods assist the fire to burn more freelv. 



ARTICLE III. 



ON HEATING A GREENHOUSE BY MEANS OF HOT WATER, &c. 



BY C. C, OF SOMERSETSHIRE. 



According to my promise in the Cabinet for February, and by the 

 desire of your correspondent, W. S. A., in the last Cabinet, I now 

 offer a few hints on the best manner of heating a greenhouse, which 

 I hope will be of some use to the reader. 



There is no doubt but hot water is the best agent for heating a 

 greenhouse, the only thing to find out is the best manner of applying 

 it to that purpose, which, I think, will be effected by pursuing the 

 following method. 



I recommend your correspondent to get one of Stevenson's boilers 

 according with the size of his house. If the house is not more than 

 twenty feet long the smallest size will do, and as this boiler con- 

 sumes but very little fuel, the best is coke from the gas-works, which 

 is also very cheap. The boiler requires no setting, only to place 

 it on a plain bottom ; it takes but very little room and may be placed 

 in any convenient corner. At the top of the boiler is a union-joint 



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