of Horace Gray^ Esq. 



381 



/, Sash bars, one and a half inches deep, and about one inch wide, 

 sawed out of boards. The rabbet for the glass is half an inch deep and a 

 quarter of an inch wide. 



g, Ventilators ; these are made of boards, eight feet long and ten inches 

 wide ; they are hung on the top with strong hinges, and open outwards by 

 a thin iron bar (Ji) about three feet long, pierced with holes two inches 

 apart, which falls into a staple or pin, when opened at the proper distance. 

 The ventilators shut against a narrow clete at top and bottom, as shown, to 

 prevent the ingress of cold air. It is also skirted on the outside with a three- 

 inch strip of board, to bring it flush with the plank. 



h, Iron bar, for opening and shutting the ventilators. 



i, Gutters, made of boards and nailed together in the form of a V ; they 

 are about four inches deep. 



k, Ground level. 



These details we have endeavored to render plain. The 

 work is simple after the rafters are prepared. 



Our next plan, {fig. 2.5,) requires a careful examination, 

 and the details are more important ; but we have endeavored 

 to make them understood. This is also a section of the house. 



Fig. 25. Section, showing the arrangement of the ventilating sashes at the top of the 



Grapery. 



a, Centre posts. 



b b, Rafters. 



c c, Ventilating sashes, two feet long and nearly three feet wide. They 

 slide down in a frame, as shown. This frame rests upon the horizontal bar 

 c ; it is made of a central piece of plank two inches wide, on to the upper 

 and lower sides of which are nailed strips of board four inches wide, forming 

 a groove an inch deep for the sashes to slide in. 



d, Weather boards. 



e e, Horizontal bars. In Jig.2i, we have explained how they are all put 

 on but the top one. The latter is nailed on top of the rafter, and the sash 



