GLASS AND GLAZING. 37 
ing that when the price per box (of 22 lights) of single- 
thick glass, 14x 24, was $2.25, 
the cost of double-thick was — 
$2.85. S= 
There are two styles or 
methods of laying glass,—the old- 
time or common method of lap- 
ping it, and the butting it end to @ Y 
end. The advantages of the but- YG 
ting method are supposed to be y; 
the greater ease and speed of lay- oe 
ing the roof, a tighter roof, one \ 
which admits more light because \ 
of the absence of laps, and econ- \ 
omy of glass. The style of bar 
to be used for butting is one with ] V| 
b 
FF S=a. 
FFS]!]!PE=S 
YY) 
\\\ 
A \\\\’ 
4) 
TLL 
RTL 
UL, 
aN) 
R\ 
CITT SSS, 
a very shallow muntin or projec- 
tion on top, as in 
that shown om the 72: Wall, plate, and sash-bar. 
right in Fig. 17. The glass is not laid in 
putty*, but it is advisable to have the bar 
freshly painted in order to close the joint 
with the glass. The panes are laid end to 
end, and are held in place, when an entire 
run has been laid, by screwing down a cap, 
as shown in the illustration. It is often 
advised to cover the ends of 
the panes with a thin film of 
white lead, in order to cement 
the panes together and thus 
close the joints. All the lead 
which is squeezed out of the 
21. Tin gutter at foot of the jointis afterwards scraped off, 
sash-bar. so as to make a clean and 
LTE 
*A durable putty for glazing purposes is made by mixing pure whit- 
ing in oil, and then using about three parts of this, by weight, to one of 
pure white lead, mixing the ingredients thoroughly. 
