THE DETAILS OF THE SASH-BAR. 



2 9 



The sash-bar. There is much diversity of opinion re- 

 specting the best form of sash-bar. Common types are 

 shown, half natural size, in Fig. 17 (page 35). The shoul- 

 ders at the top are to receive the edges of the panes of 

 glass. The cap upon the sample at the right is to hold 

 the glass in place when the panes are butted, a matter to 

 be explained shortly. The grooves in the sides of the 

 bars are designed to catch the water which condenses on 

 the glass, carrying it down to the plate, and thereby 

 preventing the "drip." 



For myself, after long study of glass houses, I am con- 

 vinced that this groove has little if any value. It weaken 

 the bar and adds to its cost. It rarely catches all or even 

 most of the water, for the condensation flows downwards 

 off the pane, and not sidewise. It is said that the condensa- 

 tion may be carried into the grooves by taking care to lay 



13. Houses with sash-bar frames. 



the crowning side of the pane up, thereby having the hollow 

 side underneath ; but good glass should have very little or 

 no crown, and it is rarely possible to make sufficient slant 

 towards the bar to carry the water to it. But I should con- 



