52 GREENHOUSE CONSTRUCTION AND HEATING. 
from 8in. or Yin. to 12in. in length, according to the size 
of the stuff. To make a joint of this kind truly, run the 
marking guage—set to the exact half of the thickness of the 
ee 
= =) ee 
Plu, os. 
quartering—along each side and across the end, and then 
mark with a square across the end of the piece to be cut out. 
Now cut about half-way down on one side with a rip-saw ; 
reverse the timber, so as to prevent the saw running af all, 
and cut down from the other side. When the saw has run 
far enough, cut the piece off across the base, slanting the 
saw very :slightly inwards, so as to make a close joint. 
Give each face a thick coat of paint or Stockholm tar, and 
secure with about five stout screws. 
End-plates are made as shown in Fig. 34, the rebate, to 
take the lower ends of the squares of glass, being placed out- 
side. These, and the side- or wall-plates, are also halved 
and screwed together at the corners, and here the latter must 
; overlap the end-plate, so that the end rafters 
may be properly fitted and secured at the 
base. 
When all have been fitted, the plates, 
which are usually left rough on the under 
sides, should be well bedded in good lime 
Fig. 36. mortar—or-a mixture of mortar with a little 
Portland cement may be used—on the top of the walls, 
driving them down well with a mallet, where necessary, 
until the spirit level shows a perfectly flat and even surface. 
