PASTEURIZATION 91 



about 1893. In 1894 or 1895 he persuaded Cornish, 

 Curtis, & Green to build one of the first "holder" pasteur- 

 izers made in this country. About the same time Strauss 

 of New York City began to pasteurize milk under the 

 general direction of Dr. Freeman. This milk was for the 

 Strauss charity infant feeding. 



Continuoiis method. — The dairy industry seemed to 

 demand a faster method of pasteurization, which could be 

 accomplished by the continuous method. As early as 

 1896, A. Jensen, now president of the Jensen Creamery 

 Machinery Company, perfected a continuous-flow pasteur- 

 izer, at Beloit, Kansas. This machine was first exhibited 

 at the National Creamery Butter-makers' Association 

 convention in 1898 at Lincoln, Nebraska. The present 

 continuous-flow Jensen pasteurizer was first made in 

 1902. About this time the Reid, Farrington, Miller 

 machine and Sturgis & Burns machine were put on the 

 market. Two or three years later the Progress, Simplex, 

 Triumph, and other pasteurizers were invented. 



The regenerative method of continuous pasteurization 

 was the next step in the development of pasteurizers. 

 This process consists in conducting the cold milk or cream 

 into the machine in such a way that it is heated by the 

 outflowing hot milk or cream. It is said that efficient 

 regenerative pasteurization employs only about 10 per 

 cent as much heat by steam as the old method. It is, 

 therefore, much more economical than the first system of 

 continuous pasteurization. Lehfelt ^ of Germany was 

 the inventor of the regenerative system. Willmann ^ 

 perfected this system in 1899 while in the factory of his 

 father-in-law, Edward Ahlborn, Hildesheim, Germany. 

 Later, Willmann came to America. 



1 Willmann, J., Letter to author, 1917. 



