The Portland daily press., 1874-08-31
How '-,udin,ion Concern, , a,m.,.

fadintion Concerns parmer.
- o, Ayndal in lecture said.-"A ooh
Meo pread over blossom is snftic;ant ~, ~
pr4S ct il from a nightly chill.n In this rs,ho ~
q, ~ ancliul expression we have a bint NJ !
: ..eat TACT In natural science. The best of IL
Is III the practical bearing it has upon tbe
comMoh things of every day farm-lifs. Radi-
atlon Teiels to heat. Without going into an
examination OF the quality and general prom
emles OF heat, let us look at its most remark.
spie eproperty-fadiation. II we heat a brick
~ IN tne nre and then place it on the ground lis
neat begins to radiate in every detection Rv
holding the hand beside it we perceive ~
escaping heat: By placing the hand over il
we hotlce an increased radiation, if wa ra-
move the brick and examine the crornJ -
IlL iinu !. aiS9 mas oeen heated. enough i'm less
ae9ree. Had we placed the bTot sno,, ,o0s
tns plock oL ice radiation would have gone on "a
01UaT,aauu Erona .hasa a. nr rAch greater speed.
daaI n,;thNr 1mmon things farm-life has TO
nrocoeds i, s,iants, animals, &c.-radiation
everv e ~ Icessantly. When we consider that
tair .,iant or animal that lives must main
'' certain fixed temperature or die. the
practical bearing of the applied science of
radiation becomes plain. The turnip will not
thrive IN temperature of less than 40 deg
no Hover will bloom il the air stand below
90 deg. no COW or horse can live in health
unless its blood stands at blood-heat. and
every child that lives must be protected from
laulatioh by suitable clothing, that its animal
heat ~, may never iaA below the happy 9S deg.
To return to our experimental brick.
Ihere IS nothing like experiment. Experi-
lnehts snow US the working of natural laws.
AppHed science is nothing more than car
rying the results of pure experiment into
real life. Heat the brick and this time place
IL on the hearth in the warm kitchen. Rad-
atioh lakes place as before, but at a slower
rate. Ii it is chilled in halt an hour outside,
mere u VIII be perhaps an hour cooling, and
even then will not become so cool: that is II
1t cools to 40 deg out of doors, here it NAV
not fall below As deg.
Nollce THIS little fact, and stow it away in
your mind. Presently you shall see its appl-
cation to your COWS in the barn. There are
dollars and cents in the latter matter. Now
neat three bricks and ask the house-keeper
ior piece or wooen cloth, muslin hand
kerchief and an old newspaper. Now lift one
brick from the stove with the tongs and roll ID
up in the woolen. Twine the handkerchief
round another brick, and wrap up the other
tightly in the paper.
Meanwhile lei us examine another matter.
Heat brick and drop it into pail of water.
lake 1t out at once, and notice how Quickly
it has cooled.
10 return to our packed bricks. We find
lhe woolen-covered one at perhaps one hun
dred and fifty degrees, the paper covered one
at about one hundred degrees, and the mus-
uncovered one at sixty degrees. To look at
the practical side of this we see that radiation
proceeds at different rates through different
substances. Suppose the brick child. His
animal heat would have radiated through the
mu N quickly and been almost entirely saved
by the wooden.
As another experiment wrap the woolen
rOnn6 in II.
face of the brick is exposed to the air. Law
it down exposed side up. Tear Off a bit Of
the newspaper slightly larger than the brick,
and lay it upon hot brick. Roll up more
paper and make cap or tent over another
hot brick. We find that the woolen-covered
one is the coolest this time. The one with
the paper shade over it less cool, and the one
with the paper hood warmest of ALL Where
lore? Simply because radiation into the air,
when it is free to move upward, is most rap
Id. The Woolen about the sides is nearly
useless while the top is exposed The bit of
paper, though it only covers the top, does
better, as the upward movement of the air
about 1t IS In measure prevented. The pa
per hood being alright, locks in a cone
shaped mass of air. The air, unable to es-
cape with its heat, stores it up, and reradi-
ates it again, and so checks the cooling of the
brick.
To save plant from early frost protect it
from the top. Radiation is most active up
ward. A paper screen over the top win ac-
complsh more than a wooden wrap round
the sides. A paper hood would be best of all.
Make your barn tight, especially about the
top, and your cattle will eat less, be in a bet
ter condition, and bring a. larger return in
miik or meat. Radiation ifOm their bodies
being reduced, health, comfort and happl-
ness will return to them, and money to you.
A barn full Of cracks is an offense against sci
ence and your pocket
A small blanket on the top of a horses
back will do more good than large one bad
ly fastened on.
Radiation takes place more rapidly through
water than air. Radiation through aqueous
vapor is SLOW. Keep all the feet on your
place dry, be they shod with iron or leather.
TO save your greenhouse coal keep the air
inside damp. Radiation is slow in damp
quick in dry one. To save
your vineyard from an early frost, build fires
OF green wood among the vines at night. The
aqueous vapor caused by the smoudering
wood will act as blanket and perhaps save
the crop. A fire of dry wood, warm it ever
SO fiercely, will not do half so much good.
Apply these few facts to your everyday
life on the farm and you will find money in
them.