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PRACTICAL PAPERS—BUTTER FACTORIES 
Fig. 12 .— Millar's Circulating Coil-Heater for Fac¬ 
tory Milk-vat, (consisting of coil of gas-pipe en¬ 
closed in brick 
219 
The factory vat (Fig. 
13) is constructed on 
the same principle as 
that for farm dairies. 
The fire-box under¬ 
neath runs from end 
to end. It is sim¬ 
ply a copper cylinder 
with a jacket two in¬ 
ches or more from, 
cylinder on lower 
side, so that water 
surrounds the cylind¬ 
er or fire-box. This 
vat requires but 
very little fuel. I 
have one of the 
farm vats upon my 
farm, and my farm¬ 
er, in summer has 
done all the work 
in making cheese 
from my dairy of 30 
cows, using only a 
“ pan of chips,” say 
10 to 12 quarts. 
The pipe hanging 
over the vat is a 
movable syphon for 
drawing off whey. 
It is represented with 
one end inserted in 
the tin strainer, 
which is also mov¬ 
able, or so as to be 
detached. B is the 
smoke pipe. 
