(<57^ JAPQGS WAY 273 



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, ( 1 ) 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) sucliou 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 

 outflo\\'ing 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 272. 



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 270. 



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 \vhen you sell. 



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

 the farm caused by the better appearance of the barn. 



Sizes and Construction 



Made in two sizes, having barrels 24 inches and 30 inches in diameter. 



The heights are 1 2 ft. 3 in. in the 30-in. diameter ; 1 ft. 8 in. for the 24-in. 



The 24-in. ventilator has a base 50 x 50 inches over all on cornice by 

 27 inches high; weight of base 58 lbs. The 30-in. ventilator has a base 

 60 X 60 inches by 33 inches high; weight of base 99 lbs. 



SPECIFICATIONS 



(See Page 2 72 i 



1 . Double cone steel top, solidly fastened on. 



2. Galvanized pipe "n-.-inch outside diameter. This pipe passes into cone 6, to 

 whicfi it is securely soldered, and is also threaded into a malleable casting mounted inside 

 of revolving hood (7). 



3. Full bodied, double strength stamped zinc. Vane securely fastened to pipe and 

 ahvays keeps opening (8) to the wind. 4. Malleable Arrow. 



5. Glass ball five inches in diameter. Extra heavy. 



6. H^avy gahanized cone, adds to appearance, strengthens pipe \\'hich carries ^"ane. 



