10 
J^evo Mode of Glazing. 
having only a superficial acquaintance with the nature and effects of ill- 
constructed roofs on vegetation, should be daily cavilling as to which 
is best suited for the purpose; we therefore invite, as we before stated, 
the attention of all practical men to this unsettled question; and shall 
be happy to insert any opinion respecting it. Experiments of this kind 
are under our esj)ecial notice, and have been for a considerable time ; 
and as soon as they are completed we will insert them in connexion 
with any other account that can possibly be collected, and endeavour if 
practicable to set this conflicting subject at rest. But to proceed:— 
The outer frame of the sash is made in the usual way, and rabbetted at 
the inside of the head and side-stiles of the frame or sash, to receive the 
outside edge of the glass; the inside of the frarne is fui nished with bars, 
the upper surfaces of which are flat, and made even with the rabbet ( Fig,2y 
aa) at the sides and head of the frame. The glass is cut in squares, so 
that when placed on the bars, it 
meets quite close at the edges, up 
the middle of the bars, (6 b) and 
close to the sides of the rabbet, {a) 
In this progress of glazing, a very 
thin coat of putty is laid on the 
surface of the bars upon ^^hich 
the glass is placed, and then 
pressed down, so as to leave the 
least quantity possible remaining 
at the under side of the glass. 
The squares are secured by 
means of a metallic screw, (A) 
and lead collar, (B) screwed on 
at each angle, (c c) the lower 
edge of the collar being bent 
down to hold the glass in its 
place. When the sash is com¬ 
pleted, it has a most beautiful appearance. The screw heads being flat, 
their projection is very trifling. 
There is a very extensive vinery, in this part of the country, glazed 
upon this principle. The rafters are metallic, and consequently narrow; 
the whole of the roof, including the rafters, is covered with glass, and 
its appearance is handsome beyond anything of the sort ever before 
erected, and when viewed obliquely, has the effect of a complete sheet 
of glass. The expense of glazing over the rafters will be no more than 
the usual cost of painting, as small sized squares are used. 
Not only is this mode to be recommended from its elegant appear¬ 
ance, but also from the advantages it possesses in other respects over 
the old method; for in consequence of there being no mid-rib above 
the glass, there is much less shade than in the old plan, which is of some 
