USE OF WINDOW SHADES 



33 



-*S5Sfit* 



Side 

 Elevation 



(OC) 



FIG. 149. 



The glass in a large greenhouse at Edgely Pa., was secured to the 

 sash-bars as shown in (a), Fig. 149. It will be seen that the glass is im- 

 bedded in putty on the under side only, and that any water that can pos- 

 sibly leak through between the bar and the glass will be caught in 

 the drip trough "a", and be carried to the eaves. The lights are 

 16" x 24" and the sash-bars are spaced 24^4 ins., c. to c. The lights 

 are held in place by two patent glazing points per light, driven in such 

 a way as to prevent the glass from moving. The lights overlap but 

 i-i6-in., the leakage having been found to be smaller and less liable to 

 occur with this than with a larger lap. 



The Paradigm system of glazing is shown in (b) Fig. 149. This 

 system is in use in a large number of shops, among which the steam 

 engineering buildings for the Brooklyn Navy Yard, described in Part 

 IV, is one of the best examples. The patents for the Paradigm skylight 

 are controlled by Arthur E. Rendle, New York. 



Skylights are of two types; (i) box skylights covering a small 

 area and placed on a curb raising the glass above the roof, and (2) 

 continuous skylights usually placed in the plane of the roof. The glass 

 used for skylights varies from % to % inch thick and should preferably 

 be wire glass. The glass used for skylights usually comes in sheets 

 about 20 inches wide and up to 8 feet long. 



The details of a box skylight manufactured by Vaile & Young, 

 Baltimore, Md., is shown in Fig. 150. 



Use of Window Shades. Where factory ribbed glass is placed 

 so as to throw light on the ceiling, screens or shades are seldom required, 



