during the entire operation, but whether it has obtained any 

 extensive use I do not know. It can be cleaned by loosening 

 the top. 



Sturges, Cornish & Burn Co., of Chicago, has put on the 

 market a tubular heater shown in Fig. 52. It consists of a 



horizontal drum with 

 a larger reservoir in 

 one end. In the drum 

 is a battery of tubes 

 about f inches in 

 diameter and one end 

 being accessible these 

 can be cleaned like 

 gun barrels, as they 



also open into the reservoir. In this there is a partition so 

 that the cold milk enters at one side, passes through half the 

 tubes to the other end and returns by the other half. The 

 drum is filled with water through funnel on top and is also 

 provided with an overflow; a steam jet at the Tee on the pipe 

 below the bottom of the drum heats the water and keeps it 

 in a lively circulation. This heater is certainly very effective 

 and they also make vertical pasteurizers on the same princi- 

 ple only the tubes are one inch in diameter which makes 

 them easier to clean. The tubes are made of drawn metal 

 tinned and are as smooth as can be. This heater can easily 

 be converted from an aerating to a completely closed one by 

 having a tight cover on the reservoir for those who believe 

 in total exclusion of the air. 



A NEW DEPARTURE IN HEATERS. 

 Lefeldt & Lentsch's (Germany) latest sterilizing and pas- 



