^(5?Se jA(xiGs wa-V 



283 



This adds the direct pressure of the wind to the other motive forces, further 

 accelerating the outward flow of air, instead of impeding it by causing eddies 

 as in Fig. 8. 



Thus we see that the James Revolving Hood Ventilator has for its 

 motive forces, ( I ) the difference in temperature between the air in the flue 

 and the air out of doors; (2) "aspiration" — the wind blowing across the top; 

 (3) suclioit applied at the outlet; and at certain times (4) wind pressure. 

 And, as compared with other ventilators, it has a larger outlet space for the 

 outflowing air — unimpeded by sharp turns or obstructions. 



The James Ventilator is absolutely storm proof — neither snow nor rain 

 can enter; nor can birds get in, all openings being covered with galvanized 

 bird proof netting as shown in Fig. 3, page 278. 



The James Ventilator lasts a lifetime; does its work without attention; 

 interferes in no way with hay carrier track; and is easy to put in place. 



Good Looking Barns 



The James Ventilator is the finishing touch that makes the barn good 

 looking. See page 284. 



There is real value in a good-looking barn, for pleasing buildings increase 

 the desirability of the place, give passers-by a better opinion of the owner, and 

 assure a better price for the farm when you sell. 



The ventilator is worth its cost, if only for the increase in selling value of 

 the farm caused by the better appearance of the barn. 



