134 MULLIONS SUPERSEDED BY SASH-WINDOWS 



FIG. 90. Chimney- Piece in the Jerusalem Chamber, Westminster. 



framework (generally of iron) which was hung at the side and 

 opened like a door. Then, from somewhere but nobody knows 

 exactly whence or when came the ingenious sliding sash, which 

 was hung with cords and counterbalanced by concealed weights, 

 so that it could be moved up and down. This was really a 

 remarkable change, although we are so accustomed to sash- 



