THE DETAILS OF THE SASH-BAR. 29 
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 
r3. 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- 
