No. 6. DEPARTMENT OF AGRICULTURE. 527 



the middle or on both sides, or on the end of the room, because we 

 have the same thing that we have with a big stove. It won't 

 make any difference with an old fashioned big, box stove, which 

 end the pipe is on, if the draft is in the other end, and that is really 

 what we are dealing with. We are dealing with a big box stove, 

 practically so. Now if the air currents are proportioned properly 

 around this room, they are bound to find this out-take flue up to 

 a certain length. 



MR. McHENRY: In running that up to the side, how much above 

 do you want the flue to extend? 



MR. COOK: How high is the barn? 



MR. McHENRY: Say, thirty feet. 



MR. COOK: There is nothing in the way anywhere, no big trees 

 nor anything of that sort? 



MR. McHENRY: No, nothing in the way. 



MR. COOK: Four or five feet will be ample above the ridge of the 

 barn. 



MR. McHENRY: Will the same thing hold good with the chim- 

 ney? 



MR COOK: Yes, the principle is the same, but the problem is 

 a harder one. 



MR. McHENRY: As I understand it, this flue will need go higher 

 than a chimney would under the same circumstances. 



MR. COOK: Yes, and put a cover over the top of the flue and don't 

 interfere with the current of air. 



PROF. VAN NORMAN: How about putting a double door at 

 the top of your flue, connected with a rod, so that when the wind 

 blows on it, it will be possible to regulate it? 



a 



MR. COOK: One of the nicest theories that was ever promul- 

 gated, but it don't work in practice. I know of several barns con- 

 structed like that. We want to let everything absolutely alone on 

 top of this flue, and let nature take its course right across the top. 

 I would not do anything, only just to be sure that the" top of that 

 flue is up in good fresh air, with a cap over it to keep the rain out, 

 and the trouble is over. 



A Member: Must that cap be put on rods? 



MR. COOK: Yes, take some small pieces of iron and set it up with 

 half inch iron. You can build this flue — I did in my own case above 

 the ridge of galvanized iron, because it looked much better than 

 boards. 



MR. HERR: You have to have the cap upon it on the four sides, 

 or the top sides? 



MR. COOK: Have it open out at the sides, just set it up above the 

 flue, nave it open all the way around and sustain it there with a 

 half inch iron rods. 



