AMOUNT OF LIGHT REQUIRED 



1^- -. gffy ... -* 4&0' 



Ife. -- -' .... ........... 992'Certtv to Center. 



FlG. 157. SHOPS OF THE GRANT TOOI, WORKS, FRANKUN, PA. 



per cents of the entire roof surface as follows: Blacksmith shop 30 

 per cent; machine shop 36 per cent; and paint and repair shop 55 per 

 cent. 



The Lackawanna and Western Railway blacksmith shop has 13 

 square feet of skylight per 100 square feet of floor area. 



In the Great Northern Railway shops at St. Paul, Minn., Railway 

 Gazette, June 16, 1903 all skylights have J4~ m ch ribbed glass, below 

 which is double strength window glass. Suitable drainage is provided 

 for the moisture which collects on the upper surface of the latter. Wire 

 netting is stretched under the skylights to prevent broken glass from 

 falling into the shops. The walls are supplied with windows set at 12 

 feet centers, 55 panes to each sash. 



The skylights of the A. T. & S. F. R. R. shops at Topeka, Kas., 

 are made of translucent fabric, about 20 per cent of the roof surface 

 being fabric. 



The skylights of the machine shop of the Chicago City Railway 

 are made of wire glass, about 35 per cent of the roof being glass. 



