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. 



PERFORATIONS- -- 



COOLING DRUM 



TROUGH TO 

 COLLECT MtLK, 



Fia. 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 



