526 ANNUAL REPORT OF THE Off. Doc. 



will give them about five hundred cubic feet of air space, and that 

 will be all any dairy cow needs, in fact, she would be better off with 

 less than with more. I would rather undertake to warm less than 

 that, and supply fresh air often, than to warm more than that and 

 reduce the current of air into the room. Five hundred cubic feet of 

 air space is enough. That will be sufficient for each cow, where you 

 have no more than thirty cows to supply. Now give her that, and 

 putting no more than thirty cows into the room, I feel very sure 

 that one flue will suffice. I am not sure but that it will do more; or 

 3'ou can divide the flues as you see in this model and carry it up half 

 on each side. We can expect one set of flues like that for thirty 

 cows to be ample. Now that would give us, you see, about two feet 

 and a half square, or two flues 15 in. by 30 in. Your flue must 

 always go to the highest point of the barn. If you have ever had 

 any experience with boilers, running them up to their capacity, 

 maybe you have found that your smokestack was not long enough. 

 I have had that experience myself; I have a creamery located where 

 trees have been planted fifty or sixty years, and I have had to go up 

 above those trees or the current will work down, and interfere with 

 the draft. Now we have the same proposition in this ventilating 

 flue. 



I visited a concrete barn recently where the out-take flues were 

 short, projecting through the roof, and covered tight with a con- 

 crete cap. Small openings being left in the sides — of course the 

 circulation was sluggish and the system a failure. 



The SECRETARY: He didn't want the rain to get in, and the snow. 



MR. COOK: To secure the circulation that he wanted — he should 

 have carried those flues up through this concrete roof, as he could 

 easily have done with a box, and left the box in there, and then come 

 to the center, and gone up there about ten or twelve feet; that is 

 what he will have to do. He will have to get both flues high enough 

 to get the circulation. 



COL. WOODWARD: We notice that your out-take flues have 

 small apertures at the ceiling. 



MR. COOK: These openings should be full size of the flue, and are 

 used when the room is too warm. It may be necessary to use them 

 all of the time. 



There does not seem to be much doubt but the circulation could 

 be all taken out above if we could thereby control temperatures. 

 Some experiments conducted in New York tend to show that the 

 purest air is near the floor. 



In order to be on safe ground, let me say, use the upper flue 

 openings, except when the temperatures run low then close them. 



PROF. VAN NORMAN: Will a six-inch wall do it? 



MR, COOK: Usually, it would, yes. 



MR. CLARK :_Do you believe that putting up this ventilation in- 

 side of a barn would be better than to take it from the center of 

 the building? 



MR. COOK: I do not believe it will make any difference so far 

 as the air in the room is concerned whether the out-take flue is in 



