EI'FICIi:.\'CV ()¥ J'ASTKURrZKRS 



211 



of heat as water is. This would mean that a quiet la_\er of \\'ater 

 3 mm. in thickness would offer the same resistance to heat as a 

 layer of copper 2 meters in thickness. Conseciuently a AX-ry 

 thin layer of water or condensed steam on the sides of tlie heating 

 wall would greatly interfere with the economic cllicienc\' of a 

 pasteurizer. 



In order to OA'ercome this dilTicult_\' drip-rings were circled 



l''iG. Oy. — Jensen sanitan' pasteurizcr-regtneratcr and cooler (Jensen 

 Creamery ]Machiner^' Co.). 



round the drum of the pasteurizer, at inlerA'als, on the steam side 

 of the heating surface. The hrst rings put ar(.)und the pas- 

 teurizer were narrow, smooth banfls. These did not give entire 

 satisfaction, as the conflensed water from the top rings would 

 drip on the edge of the lower ones, and cause the water to spatter 

 over the side of the heating wall. Another kind of ring was then 

 invented which was thin, narrow, and proA'ided with teeth like 



