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Wisconsin Dairymen's Association / Fortieth annual report of the Wisconsin Dairymen's Association : held at Beloit, Wis., November, 1911. Report of the proceedings, annual address of the president, and interesting essays and discussions relating to the dairy interests
(1912)

James, W. D.
Building the dairy barn,   pp. 64-81 PDF (3.4 MB)


Page 79


Wisconsin Dairymen's Association.
confident that that system of ventilation will work and work well.
Whether it will work in theory or not, my experience confirms what
Mr. James has said as to its working in practice.
Mr. Emery: I think that system will work well. I think a system
by which the opening of the ventilator is placed near the center so
that the air can come from all sides around to it, instead of on one
side, will work better. That is the only point I make. Now, about
this mixing of the air. That mixing of the air in a room is done by
the principle known as diffusion of gases. It is ascertainable, and
the books record the degree and the time in which this diffusion of
gases takes place. A peculiar principle acts, so that this carbon-dioxide
gas which is heavier than the air has a tendency to settle. At the
same time there is another principle working against that, tending to
cause the heavier gas to rise-by what is known as the principle of
diffusion-all the while toward the surface, and causing them to com-
mingle, and where ventilation consists simply of a change of air in a
room this theory-not only theory but a demonstrated fact-of the
warmer air accumulating along the ceiling, being warmer, increases
in expansive force as it is warmed and creates a pressure downward.
That pressure downward tends to drive this air in the lower portion
of the building out through these ventilating shafts. That is the whole
principle and you have it just the same as you have with a dish of
water replacing air. The top of the bottle represents the ceiling here
and as you pour that water into the bottle and it reaches the top, it
is going to overflow. So when you fill this barn with air and press
downward, it is going to overflow in the reverse way from what the
water do. I do not say these things for the purpose of controverting
any assertion that this plan will do good work; I believe it will. I be-
lieve that this system is by far the best means that we know of for
handling barns, but I maintain as a result of not a little study and
some experience with this whole system, that when you place these
nearer the center so that the air can come out from all sides toward
it, you will get better ventilation than you will when you place it at
the ends of the barn.
Mr. Goodrich: This other barn over here is calculated to take in
hay at the end. How will you manage your ventilating flues there?
Mr. James: In that barn the cattle face out. You will notice that
the ventilators are on either side of the center and there are ten feet
between the flues.
Mr. Everett: I believe there is a great deal of suction. Why is a
chimney run above the roof? The ventilator is nothing in the world
but a chimney to take the foul air out of the barn, instead of smoke,
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