132 BUTTER-MAKING. 



ment in the separation of cream from milk. This led to con- 

 tinuous milk and cream discharges, and consequently also to 

 the continuous inflow of whole milk. These machines were 

 of the hollow-bowl construction. 



Modern Separators. Since the year when the Danish Weston 

 and the De Laval machines were invented, many different 

 types of separators with different contrivances within the bowl 

 have been put upon the market. Baron Bechtelsheim, of 

 Munich, is given the credit of having discovered that certain 



FIG. 71. The United States separator. 



contrivances on the inside of the machine increase the efficiency 

 and capacity of skimming. This discovery was made, accord- 

 ing to J. H. Monrad,* in 1890. This invention was bought by 

 the De Laval Company. 



The principal part of practically all the separators is a bowl 

 rotating in a vertical position, with or without contrivances 

 inside the bowl. Machines having a bowl rotating in a hori- 

 zontal position are, so far as the authors know, not in use at 

 the present time. Such a machine was once manufactured at 

 Hamburg, Germany, and was called "Peterson's Centrifugal 



* Dairy Messenger, Jan. 1892, p. 9. 



