The Butler weekly times. (Butler, Mo.) 1881-1918, 1911-08-10

| 1T Is good plan to measure out two
samples for each COW, in case one
should be broken while making the
test. The reading on the two bottles
should not vary more than one small!
space, or 2 per cent.
Have some scalding hot water con-
venient.
Adding the Acid.-Commercial sui.
phuric acid is used. This may be OBJ
tanned from any druggist, or in larger
quantities from a creamery supply
house.
Fill the acid measure up to the
mark and pour into the test bottle.
Hold the bottle slanting so that the
acid will run down the neck and un-
der the milk. Rotate the bottle slight
y while pouring in the acid to wash
down any milk that adheres to the in.
side of the neck. When the acid is
! added, mix the milk and acid with a
gentle rotary motion, taking care to
prevent stopping the mixture into the
neck Mix until all the white curd
has been dissolved, and the liquid in
the bottle is of brown color.
When the acid has been added to all
and mixed, the bottles are placed in
the centrifuge arranging them so as
to balance. Whirl at the speed given
in the directions that come with the
machine. Nearly all hand machines
are made to run from so to 100 turns
of the crank per minute. Whirl for
five minutes. Stop the machine grad
ually. Add hot water to the bottles
with the pipette until each is full to
the base of the neck. Whirl again for
two minutes and stop. Add more hot
water until the neck of each bottle is
full to within an inch of the top.
Whirl again for one inmate.
Reading the Test-The neck of the
standard milk test bottle is divided
into ten large divisions, and each of
the latter into five small divisions
Each large division is one per cent, |
and each small division two-tenths OF
one per cent.
If the butterfat fills three large
spaces, there is three per cent OF rat
or three pounds of fat to the hundred
of milk. and would be written 8 per
cent. If the fat column covers five
large and two small spaces, the read
ing would be five and four-tenths,
written "a per cent.
The dividers are used to conven'
ently measure the length Of the fat
column. TO do this, the extreme
length is taken by placing one point
at each extremity of the fat column.
Then without disturbing the spread"
of the dividers, one point is placed at
the line on bottle marked with 0,
and the reading made where the other
point touches the scale. This method
fat easily and accurately
Cautions and Remedies.-If sam
pie curdles before testing, start new
one, adding few more drops OF
than at first.
Sulphuric acid destroys clothing and
care. If spilled on the hands, wash
off with water at once.
Keep the bottles hot while testing,
and they must be hot when the read
ing is taken. If they become cold,
place them in hot water up to within
an inch of the top Of the neck and
leave for five minutes before reading.
If the test has been properly con.
Quoted, the fat column will be clear
with no sediment present, either be.
low or above If a white cheesy sedi.
ment shows under the fat column. use
a little more acid next time. White
foam on top of the fat column is usu' .
ally caused by using hard water, and
may be avoided by using rain water
If the fat column is dark, or mas ;
black sediment below the fat, use less
acid or cool the milk. Keep the acid
bottle tightly stopped with glass
Or rubber stopper, as sulphuric acid
absorbs water from the air and be.
comes weaker.