Rocky Mountain husbandman. [volume] (Diamond City, Mont.) 1875-1943, 1877-03-08

temperature, the uucC was Inaue 100 1eeI Ill
length and nine feet and six inches in depth;
a single duct of two and One-half feet in
cross-section, having q fall Of about ten feet
toward the building, and costing just $OO.
Said duct was open at either end, and was
in operation from Oct. LIST until Nov. goth,
before the milk-room was occupied.
During that period, the outside, shade
temperature varied from 500 to 100, by
day !; and the action of the duct was tested
at the temperatures named, and at various
intermediate ones, and observed by a large
number of persons interested i'll the result.
The air flowed continuously and rapidly
down the duct by gravitation. and its tenn
p%erature at the point of escape into the milk
room was found to be uniformly 4So by one
thermometer and. 400 by another. But
when, the external temperature fell below
49, ), the circulation in the duct reversed,
the air in it, having absorbed heat from the
walls, became raratied and lighter than the
external air,-hence was. buoyed up, and es-
capped at the higher end, at about the same
temperature at which it had escaped at the
lower end. When, however, the sash were
placed in the milk room, which was neces-
sary before the room was all plastered, to
exclude frost and the boiler in an apartment
adjoining the mifk-room, used for general
ing steam for churning, cleansing milk YES
sells, etc., and the exhaust valves were open
ed into. the vertical ventillating shaft, or
chimney, enveloping the smoke-pipe OF the
ho;lor N Jroft ynS avarto1 on tho oir ricinu
through the, dact, sufficient to reverse the
circulation, and cause it to. act again as a
supply to the, room, and for the purpose of
drying the walls, there, being no, other
source of air supply used, a potent vacuum
was created in the vertical shaft, WHICH drew
the air rapidly the duct, and to such, a de-
gree that the full warming influence. Of. the
duct was not utilized, (.
Notwithstanding the accelerated passage
Of the air down through the duct, in opposi-
ton to it's natural course, it has continued
to enter the room regularly and uniformly
for weeks at4So, while the external tenn
perature has varied from $50 above to 2lo
below. On the morning of December Sth,
the mercury stood q Q below, the tempera-
ture of the milk-room was 600, and the air
entering the room from the duet was 40.
Thus it may be seen that the air in the room
from the duct, it being gao, only required
to be raised by artificial heat 16o to secure
co. the temperature desired; yet the air
was rapidly changed, as stated, for drying
the room. Had the desired change of air
been continued, and had the supply been
taken from the external atmosphere, at the
existing temperature, 81 below zero, it
would have. been necessary to- heat it arti-
ficially 81 Q instead of 16o
The great convenience and economy of
the influence of the duct, under the circum-
stances, are so automatic, that comment on
it would be reflection on the intelligence of
the reader. 1t is proper, however, that |
state that its special advantages are most
highly priced by the dairymen of this re-
gion, as they practice winter dairying-that
is, they have the COWS run dry during dog
days, and they are in maximum profi6 dur
ing the cold season. 1t is claimed that the
advantage of winter over the summer dairy
are nearly one hundred per cent. in the use
of the sub-carth system of warming the air,
and a milk-room having n~on-condHetihg
walls, as I build them. The economy of
winter diaries is so great, and the advan-
tages SO numerous, with the facilities now
attainable, that | regret that l cannot en-
body the various reasons in this. [ shall,
however, contribute them at an early day.
There are over $4,000 COWS in this (Ogle)
oarnfr nn1 +1n 1,ra 5000. =.