DAIRY INSPECTION 183 
(a) The conical cooler (Fig. 18) is a cone-shaped 
tank with a gutter around the base and a movable reser- 
voir at the top. The reservoir has small perforations 
in the bottom around the periphery. When the cooler 
is in use, the cavity of the tank is filled with water or 
ice water. The milk is poured into the reservoir and, 
passing out through the perforations, flows in a thin layer 
down over the external surface of the conical tank, col- 
lecting in the gutter at the bottom. From the gutter 
it is permitted to run into the shipping can or bottler. 
~~2+--AGITATOR 
“VENTILATING TUBE 
~>- PERFORATIONS 
t---OVERFLOW PIPE 
FOR WATER 
Fic. 18.—Cooler of conical type. 
One model of this type of cooler has attachments 
for pipe or hose to carry cold water into the tank and 
to remove the water which has been warmed by the heat 
absorbed from the milk; another which is intended for 
use on farms without a water pipe system does not have 
these attachments, and the warm water must be removed 
and the cold water added with a dipper or similar vessel. 
(b) The corrugated type (Fig. 19) of cooler consists 
of two sheets of corrugated copper, with a small water- 
tight space between them and tinned on the outer sur- 
face. The cooling fluid enters through a pipe at the 
