28 VEGETABLE FORCING 
pipe posts are set in 
concrete walls and the 
posts supporting the 
purlins are also set in 
concrete. Glass oc- 
cupies the space be- 
tween the top of the 
wall and the gutter or 
Fig. 13.—A common form of wood wall sill. side plate. Concrete 
walls are often banked with soil on the outside, to exclude 
cold. When this is not desired the walls may be given 
a more finished appearance by applying a thin coat of 
Portland cement. 
Frame.—All wood parts of the frame, including wall 
plates, eaves-plates, headers, sash bars and ventilating 
sash, are prepared at the factories, so that the work of 
erection can readily be managed by a local carpenter or 
anyone who uses tools efficiently. The same may be said 
of the iron and truss forms of construction, although they 
are considered more difficult, and there is greater 
necessity for the employment of skilled mechanics. 
Wall plate or sill—The size and form of wooden wall 
sills are quite variable. Different means are -used to 
secure them to the wall, one-of the best being 8-inch bolts 
running through the plates at frequent intervals and em- 
bedded in the concrete. The lower end of the bolt may 
be bent to make it more secure in 
the concrete, and a burr is screwed 
on the upper end immediately 
above the plate. Fig. 13 illus- 
trates a common form of wooden 
wall sill. 
The eaves or side plates of sep- 
arate houses vary greatly in dif- 
ferent forms of construction. The 
angle iron forms of eaves-plates 
Fy . Fig. 14.—Iron eave plate. Note 
(Fig. 14) are superior to all roof bar and post bracket. 
