^^5^ JAOQGS T^9£^ 



LOW VELOCITY 



Fig. 5 

 Wooden Cupola 



Fig. 7 

 Metal Cupola — Cap is too low; outflow 

 of air is choked down. 



Fig. 6 



Metal Cupola — Cap is too high; wind 

 and rain blow in. 



Fig. 8 

 Metal Cupola with Storm Band. 



Fig. 9 

 James Solid Hood Ventilator. 



Fig. 10 

 James Revolving Hood Ventilator 



