SASH-BED CONSTRUCTION 15 



instead of lapped. This is rarely satisfactory 

 for hotbed sash; because (i) the panes are 

 often not squarely cut and do not fit well, and 

 (2) the sash have so little pitch or slant when 

 in use that water is apt to run through be- 

 tween the panes. 



Some makers offer a form of sash known 

 as "horned sash/' in which the side bars ex- 

 tend two or three inches beyond the end bars. 

 These extensions make convenient handles 

 for carrying, and it is claimed that a better 

 joint can be made than when they are cut off 



flush with the end bars. 







Double-glass Sash, as the name implies, 

 are constructed with two layers of glass with 

 an air space of about a half-inch between. 

 They have certain advantages over single- 

 glass sash which may be stated as follows: 

 (i) They give greater protection; (2) they 

 reduce labor, as it is not necessary to use 



Fig. 3. Double Glass Sash 



