COST OF TRANSLUCENT FABRIC 



307 



satisfactory as it holds the fabric tight, and will give slightly to accom- 

 modate changes in temperature. 



Cost of Translucent Fabric. The fabric costs from 13 to 15 cents 

 per square foot at the factory at Quincy, Mass. The framework, 

 freight and cost of laying will probably be as much more, making the 

 entire cost of skylights from 25 to 30 cents per square foot. 



Translucent fabric has been quite widely used and has given uni- 

 formly good results. It has been used recently in the A. T. & S. F. 

 R. R. shops at Topeka, Kas. 



Detail of Detail of Detail of 



Lap Joint Lock Joint Copped Joint 



Method of Fastening 

 Ends of Wire 



FIG. 151. 



Double Glazing. The condensation on the inner surface of glass 

 can be prevented by double glazing the windows and skylights. Build- 

 ings with double glazing are also very much easier to heat than those 

 with single glazing, the air space between the sheets of glass acting as 

 an almost perfect non-conductor of heat. 



Details of Windows and Skylights. The details of windows in 

 use in different sections of the country vary a great deal on account of 

 the varied conditions. In buildings that have to be heated and ventil- 

 ated through the windows at the same time, it is necessary to provide 

 some means of opening and closing the windows quickly and easily; 

 while in many other cases the sash can remain fixed. The author would 

 call especial attention to the saving in fuel by the use of double glazing ; 

 the loss of heat through a double glazed skylight has been shown by 



