I] DETAILS OF CONSTRUCTION 9 



mortised into the posts, it will make an excellent 

 support for the sixialler posts in the intervals. 

 These posts should be 3 J ins. x 2| ins., and if 

 mortised into the sill and eave plate, they will 

 strengthen the side of house considerably. 



The side ventilators should be the same as 

 those in plan — the bar above, and glass to eaves 

 also the same. 



The rafters of the house may also be of the 

 same depth — but no deeper — in fact, rather less, 

 as a deep rafter is a mistake. Iron columns like 

 those in the plan should be used, but not T irons, 

 as this will not be strong enough. A substitute 

 for T irons would be a wooden purlin running the 

 whole length of the house in the middle of the 

 rafters. This should not exceed 4^ ins. in depth 

 and 3 ins. in width. 



These columns should be placed 8 or 10 ft. 

 apart, but not more. Each column should have 

 a flange at the top (similar to that at the bottom), 

 and each column should be made secure by being 

 screwed into the purlin. It is a good plan to have, 

 in addition to the purlin, a bar of iron | in. x ^ in. 

 running the whole-length of the house, and screwed 

 on to each rafter to keep them in position. 



There should be two of these bars of iron, 

 one above and the other below the purlin, at equal 

 distances from eaves and apex. The distance of 



c 



