330 FORCING DEPARTMENT. 



nected by a box, twenty inches by ten, which is 

 constructed so as to connect the pipes that run 

 parallel with the front of the house, and are joined 

 to the oblong reservoir (D,) at the furthest or 

 coldest end of the house. The upper pipe is twelve 

 inches broad, the margins of which are raised, so 

 as to hold water on its surface for creating a steam 

 in the house ; it also gives out a much greater 

 quantity of caloric than the round ones. The reser- 

 voir, containing a large body of hot water, keeps that 

 part within a few degrees of the same temperature 

 as that at which the boiler is placed. When the 

 water, in the latter, is at 200 degrees, the thermo- 

 meter in the reservoir generally stands about 12 

 degrees lower, while the fire is plying; but,, in the 

 mornings, they are both of nearly an equal tempera- 

 ture, and the atmosphere of the house, at both ends, 

 is within five or six degrees of each other, even 

 when the boiler and reservoir are 50 feet apart. The 

 boiler is furnished with a wooden cover, which fits 

 into a grooved frame of the same material surround- 

 ing it, and prevents any evaporation or steam ,, except 

 at pleasure. The cover of the reservoir is of cast 

 metal, and may be taken off when requisite, either 

 for the admission of steam, the adding of water, or 

 emptying of the pipes, &c. Water should never be 

 allowed to remain in the pipes in the Winter season, 

 when not at work, as it will be liable to be frozen, to 

 expand, and burst them. There appears to be various 

 opinions relative to the boiler best suited for the 

 speedy action of the fire ; but there can be no doubt, 



