The Farmington times and herald. (Farmington, St. Francois Co., Mo.) 1902-1905, 1905-04-14
FOOD VALUE TESTS.
SCIENTISTS SEEK TO SECURE
BEST BUTTER AND BEEF.
Contine Cows TO Alright Cells in
Experiments - Special APP
paratus for the
Purpose.

The University OF Pennsylvania al
Harrisburg has lately begun expert.
ments to test foods Tor cattle. The ex-
periments are directed toward the sci
entiic feeding of cattle TO find out exact.
~ what foods are the best adapted 10
produce the best milk the best flesh anG
the best butter
II is not the plan OF the Pennsylvania
scientists who are conducting the tests
to starve scientifically the cattle with
which they are making their expert.
ments nor to try the effects OF poison
on them. On the contrary the sole pur.
pose OF The tests Is To find out what foods
or combination OF foods will produce the
riches, results and the cost thereof.
To make their tests correct they have
invented what they call respiration
calorimeter. It Is an apparatus which
measures with cXactncss the gases
heat generated in the animals body
during the process Of assimilation
Tn" respiration part Of the apparatus
attends to the gases and the calOrl.
meter 10 the temperature In this ma
chine for months past series OF the
most valuable tests has been made and
the scientists who have been supcryis
ting them are enthusiastic over the re-.
suits that they have secured
The respiration Calorlmeter consists
of double walled chamber. GxlO feet
aud eight feet high containing com
Portable stall The walls of the cham
Der nre double the inner one being n
sheet copper. while the outer one is OF
zine. with an air space between The
door through which the animal enters
and the small opening through which
food Is given To the animal. close air
tight. shutting on the interior from the
world outside except so far "a It can
be seen through a double plate glass
window.
When an animal is placed In this
Theoretically sealed cell all air is cut
on from IT, save that which is supplied
ny meter pump. which sends IN n
''''''" p""h''NS VI u'E' PuI' "I' ~
stated inter ais The pump not only
sends the air currents In, but II draws
u sample Of It at stated intervals An.
other pump draws samples for an
analysis NJ inc same instant that IN"
injector does by comparing these
samples II IL easy TO tell exactly what
ha8NS ana now much the animal has
aided /" the air ana 10 determine m"
amount OF gases given on by different
tOudS.
Tn" copper inside box OF this cham
Der is surrounded by two wooden box
IS, each box being eight inches larger
han III" one insid" II When In use
'h"N are kept At exactly III" temper
atlIr" al the air surrounding IN" stall
and thus Their" Is no loss Of heat from
n" chamber In which the animal is
placed.
bN simple adjustment IN" air Is
mai" to leave and enter the cell a the
'am" temperature. and thus Their" is
no loss on that account. So all the
neat that IN" animal gives on remains
n the chamber which Is carefully
r"'ISierrd by delicate electrical thcr
mnm"t"r5.
Ini II IN" heat remained IN the cell
II would result In the place soon be.
coming nnbearably hot and so an ar
rahE'lnent Is made 10 Keep II al one
temperature by means OF coils OF cn'd
water. Wllch ahsorha IN" neat almost
rs laSi as II IS gwen on Inc ihStrn.