382 



Description of the Graperies 



bars, (the upper ends being halved,) are nailed on to the under side ; a small 

 groove, a quarter of an inch deep, being made in the horizontal bar to ad- 

 mit the glass. Where the bars come directly over a rafter they are bevelled 

 off on the under side and nailed to the rafter. 



ff. Sash bars and glass. 



g. Box for holding weights, as shown in fig. 26. This box is made by 

 simply nailing strips of board four inches wide on each side of the centre 

 posts, and nailing another piece underneath them to make the bottom. 



The only difficult part of this plan is to adjust the venti- 

 lating apparatus tightly, so that the sash may slide upon the 

 upper side of the horizontal bar. The groove in the horizon- 

 tal bar to admit the glass, should be about quarter of an inch 

 deep, and filled with putty before the glass is put in. 



Having thus shown how the work should be executed, and 

 presuming that all is sufficiently plain, we proceed to show 

 how the ventilating sashes are hung, so as to be easily opened 

 or closed, {Jig. 26.) 



a, Ventilating sash, with a sta- 

 ple in the top bar, for fastening 

 the ropes. 



b, Pulley, over which the rope 

 d passes, for closing up the sashes 

 when open ; this pulley is set into 

 the ridge plank, and the rope, 

 passing through it and through 

 the weight c, drops down through 

 the box e, and, when shut, the 

 weight rests on the bottom of the 

 box, which is just two feet six 

 inches from the rafters. 



c, Weight, three inches broad 

 and six inches long, with the 

 rope passing through the centre, 

 and a knot beneath to keep it in 

 place. It weighs about four 

 pounds, and is sufficiently heavy 

 to keep the sash closed when 

 once shut. 



Fig. 26. Section of one of the ventilating sashes, 

 showing the manner iri which they are hung. 



d, Rope for closing the sashes. 



e, Box, as described in fig. 25, to which a pulley is attached. 



/, horizontal bar, to the under side of which is attached a pulley, over 

 which the rope g passes, and also over the pulley at e, for opening the 

 sashes. 



g, Rope for opening the sashes. 



