31 



I am afraid he will find that it will take too long, if he builds 

 them much larger. 



BITTER, who also condemns all continuous apparatus, designed 

 the one shown in Fig. 29. 



It consists of 

 a tinned copper 

 vessel which is 

 closed with an 

 overlapping cover. 

 Close to the inner 

 wall is a tinned 

 copper coil enter- 

 ing at the top (s), 

 and at the bottom 

 it turns up into a 

 smaller coil in the 

 center of the ves- 

 sel; this coil re- 

 turns to the bottom 

 and lets out the 

 condensed water at 

 p and N. Between 

 the two coils ro- 

 tates a stirrer E. 

 The milk is let out 

 at v. 



As the appa- 

 ratus does not hold more than 100 Ibs , I do no injustice by relegat- 

 ing it to experimental purposes only. 



In the U. S. Agricultural year book for 1894, just published, Dr. 

 E. A. DeSchweinitz has a treatise on "The Pasteurization and Steril- 

 izing of Milk," from which I gather that the Appleberg Hygienic Milk 

 Co., at Rawling, N. Y., has patented an "apparatus" for pasteurization. 

 It consists of a wooden box four feet square with a hinged lid. 

 On the bottom is a steam coil. Inside the coils the (rectangular) 

 milk cans, holding forty quarts, are placed and covered with perfo- 

 rated tin lids to permit the insertion of a thermometer. The cans fit 

 closely together inside the coil. 



During the process, the milk is kept thoroughly stirred (how?). 



