DOORS 



99 



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(9 PEN 



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x 2%£ sc/?/vru//cs 



y Strips- 





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Fig. 107. 



in the groove, allows for warping of the door 

 which, in the case of the ordinarily constructed 

 door, tends to cause jamming. 



Doors in Corrugated Iron Buildings. — Fig. 109 

 shows a ledged outer door. 



The door frame consists of two 4£" by 3" 

 posts A,A, which have their ends checked § inch 

 into the roof-plate and foundation-plate D,D ; 

 and a 4£" by 3" head, H, tenoned into the 

 doorposts at each of its ends, the tenons being 

 held by wedges, one of which is shown. 



Above the head H is a 4^" by 1£" rail, 



Fig. 103. 



