The silver messenger. (Challis, Idaho) 1890-1912, 1906-06-12
DIAGRAM SHOWING PROPORTION OF
FRESH AIR TO COW.


as will carry 81 pounds of water; for
the horse we would have to pump TO-
203 pals; for the COW, SAP; for the
pig, 2,209; for the sheep, 2,178; and
even for q single hen we should be
obliged to pump al many as rs pail
fulsI Fortunate 1t is for man, and
more fortunate for his domestic ami
mails, that all have been fashioned to
live at the bottom of an ocean of air.
miles in depth, e~ternally in motion
and so penetrating that he has NOT
yet succeeded in providing a shelter so
close that the currents do not sweep
through it.
1t will be clear from what has been
said that no dimensions sufficiently
large are practical in the construction
of stable room which will permit 8
sufficient amount of air to be enclosed
to meet the needs for any considerable
length of time, and hence, where many
animals are brought together, cubic
feet of space is not the essential. 1t is
cubic feet of air per unit of time, pass.
ing through the stable, which is the
III oAA OA4oAdC lolAOAs jill 81
much height of ceiling and such hori-
~ontal dimensions as will give ade-
quate working room for the carr of the
stock need be provided, and in cold
climates the higher the stable ceiling
is above the floor the colder will it be
and for cowstables eight to nine feet ia
an ample height for the ordinary feed
{p0 nurnncnu Euon for harna n4akIor
nine feet in the clear is sufficient to
prevent any possibility of a horse hurt
ing himself by throwing his head up
In order to meet the needs of 20 COWS
having an average weight of 1000
pounds, to secure the degree of purity
of air which has been assumed, it IF
necessary to. provide a ventilating flu
whose cross section is two square feet
and through which the air will move
at the mean rate Of about three miles
per hour, or 264 feet per minute
Larger animals should be provided
with proportionately larger supplies OF
air. Forty cows would require a ven
tilating iue, or fiues, having an aggre.
gate cross section double that for 20
cows, while for SO, 80, and 100 cows the
ventiIating fues should have a capacity
three, four and five times, respectively,
! that needed for 20. For ten horses a
flue 20 by 20 inches is required; for 40
sheep one IS by IS inches; and for 20
hogs, one 16 by 16 inches.
1t must be remembered, writes Prof.
f. II. King, in the Rural New Yorker,
in providing for a smaller number of
animals than has been named, It will
not do to reduce the size of the ventil-
ating fiue corresponding amounts, and
especially is this true where the build
ings are low and the ventilating f1ues
will be short, because with the small
fiues the internal friction is relatively
great and, where the fiues are short
neither the effect of difference in tenn
perature nor of wind suction across
the top is as great, and so, in provid-
ing fiues for poultry houses, or any
others which are usually correspond
ingly low, ven If the number of ami.
mails to be cared for is small, the cross
section of the flue should seldom be
much less than three-fourths, to a full
square foot. In the single story struc-
lures, which have many windows and
doors, especially where they are con-
structed of wood. the openness of struc-
ture is usually SO great that it is only
where a large number of animals are
kept together, or where the walls are
of masonry, with windows and doors
tight, that special provision for ventil-
alton is important.