524 ANNUAL REPORT OF THE Off. Doc. 



MR. COOK: Yes. 



A Member: If that flue is Like that, would that answer every pur- 

 pose if it was at the top? 



MR. COOK: No — do you mean whether we could not use a space 

 right directly through the side of the barn? 



A Member: Yes. 



MR. COOK: You can't do that because you would be up against 

 the same proposition as with your window, your intake flues would 

 serve as out-take flues on the one side of the barn, and the reverse 

 on the other side. This system is absolutely automatic, only of 

 course you will get a little more air when the wind is blowing than 

 when it is not. 



A Member: What would you build those flues out of? 



MR. COOK: Anything you please. It will make no difference 

 whether you build them of cement, iron, tiles or board. 



Now let us see about the out-take flues. We want to keep in mind 

 the working of the house chimney. We want to understand and 

 go back again to the statement that I made this morning, that there 

 are seven pounds of water in the form of vapor passing off from the 

 animal every twenty-four hours. Now I would not, if I were you, 

 concern myself with the carbonic acid gas in a barn. We want to 

 get rid of it, surely, but if you get rid of the moisture, the carbonic 

 acid gas will take care of itself. It is the moisture that troubles 

 you. Now how shall we do that? In the first place it must be 

 kept in the form of vapor in the stable, because after condensation 

 it is too late; then you can't get rid of it. • It must be kept in the 

 form of vapor until it goes out-doors. I suppose that the most of 

 you have had trouble with the stove-pipe in your house. Well, if 

 you havn't, you havn't had all the fun of house-keeping, and you 

 have found that usually where the pipe enters the chimney, after 

 running a long distance horizontally, or after it passed through a 

 cold room, that something happened, either the 'pipe may have been 

 so long that the current of air in the stove-pipe cooled off or had 

 been condensed upon it, then of course the moisture in that pipe con- 

 densed. We have the same thing to deal with here, and the farther 

 north you get the greater the problem is. The farther south you 

 go, the smaller the problem is. Now I would not build these flues, 

 even here, of iron, yet I know of a flue in New Jersey built of gal- 

 vanized iron, but I do not believe it is a safe thing to advise. With 

 us, we should be in trouble all winter if we did that — if we built 

 the out-take flue with any kind of material that would radiate heat, 

 so that I believe it is safer to build those flues in the cheapest way. 

 The cheapest way is to set up a four by four scantling, and fill that 

 four inch air space with straw. I do not know of any way by which 

 you are so certain to get good flues for so little money. Board it up 

 inside with matched lumber, and board it up on the outside and stuff 

 that four inch air space with straw. 



COL. WOODWARD: You have not indicated the size yet. 

 MR. COOK: Yes, a square foot of area for each five cows. 



