GLAZING AND PAINTING 109 



the wood, offers as little obstruction as pos- 

 sible to the brush in painting and does not 

 rust. Small sizes suitable for glazing win- 

 dow-sash in which the putty is placed on 

 the outside are too small for greenhouse glaz- 

 ing. Zinc points of various forms have 

 been frequently used because of their free- 

 dom from rust. The triangular point is prob- 

 ably the most popular of the zinc points, and 



Fig. 62. Types of glazing points 



is quite commonly used in window glazing. 

 It is not well suited to greenhouse glazing 

 on account of the difficulty of fastening the 

 panes of glass with it so that they will not 

 slide down the roof. 



Probably the most used point in green- 

 house glazing is the double-pointed staple. 

 This is easily driven and when galvanized is 

 not subject to rust. The best form of this 

 type of staple is bent to an angle in the cen- 

 ter, so as to fit over and hold the lower edge 



