380 



Description of the Graperies 



d. Doors, three feet wide each, and eight feet high. They are made 

 of two-inch plank, and the top and side rails are about four inches wide, 

 the bottom about one foot, so as to prevent any danger of breaking the glass 

 with the feet. They are glazed with three rows of 7 by 9 glass, and open 

 by sliding in a groove at top and bottom. 



A reference to the plan will explain all these details. The 

 house is two hundred feet long and twenty-five wide, and on 

 a scale, large enough to render it plain, only a portion of 

 it could be given. 



We now come to the arrangement of the walls, and the 

 manner of fixing the rafters, sash bars, «fec., and annex a part 

 of a section of the house, {Jig. 24.) 



a, Stone posts. 



b, Sill, six inches wide 

 and two thick ; the front 

 edge bevelled off, to admit 

 the top plate, d. 



c, Rafters, four inches 

 wide and two inches thick, 

 and about seventeen feet 

 long. They are sawed out of 

 planks about fifteen inches 

 wide, in such a manner that 

 two rafters are made out of 

 one plank, without a waste 

 of timber ; the curve in 

 each rafter, from a straight 

 line, being about three in- 

 ches. The rafters are three 

 feet apart, from centre to 

 centre. 



d, Front plate, six inches 

 wide and two inches thick, 

 and nailed on top of the 

 rafters ; this plate is to sup- 

 port the lower ends of the 

 sash bars, which are one 



and a half inches deep, and one inch wide, and are rabbeted half an inch 

 deep to receive the glass. These bars are let into the plate one inch, so as 

 to bring the rabbet on a level with it. 



e, Horizontal bars for supporting the sash bars. These are made of 

 plank, and are just two inches square. They extend the whole length of 

 the house, and are about three and a half feet apart, as shown in the Eleva- 

 tion, fig. 27. These bars are let into the rafters about an inch, as shown in 

 the plan, with the exception of the top one, as will be explained in^^. 25. 



Fig, 24. Section of the outer walls, showing the ar- 

 rangement of the rafters, front ventilators, SfC. 



