24 



Theil used a similar constructed cooler, but of course any kind 

 of cooler can* be used. 



In France MR. F. FOUCHE constructed what he calls a multi- 

 tubular pasteurizer. Fig. 20. 



The milk leaves the tank M and 

 enters the bottom of the heater 

 which is heated by steam entering at 

 S. After passing through a lot of 



Fig. 19. Fig. 20. 



straight tubes the milk leaves the heater and enters the cooler at the 

 top. The tubes in the cooler are cooled by water from tank w. 

 This apparatus fills the bill as far as excluding the air during the 

 entire operation, but whether it has obtained any extensive use I do 

 not know. It can be cleaned by loosening the top. 



Prof. Leze describes a heater made by HIQNETTE devised by 

 COLLET. It is a series of tubes arranged zig zag like the Lawrence 

 cooler see A Fig. 39, but, instead of having only one tube there are 

 three concentric tubes which are joined together with specially con- 

 structed concentric elbows held in position by bolts. 



By loosening these bolts the tubes can easily be taken apart. 



The milk circulates between the centre tube and the second and 

 the hot water circulates in the opposite direction in the centre tube 

 and between the second and third one. This is said to be a very 

 effective heater. 



As an experiment I designed the apparatus for Mr. A. H. Barber 

 of Chicago, which is illustrated in Fig. 21. This is really an adap- 

 tion of a cooler illustrated by Dr. Fleischmaun and made by Jelliiiek 



