MANUFACTURE OF MILK POWDER 29) 
of heated air dates back to the invention of Samuel R. Perey in 
1872. 
The Percy Process.—This process was invented and patented 
by Samuel R. Percy of New York City, U. S. patent No. 125,406, 
April 9, 1872. The process embraces in its claims, a process of 
atomizing and desiccating fluid and solid substances, also any viscid 
substance containing water, by the use of dried, heated or cooled air 
or gas, which forces the substance into atoms; the atoms are thrown 
forward, and forced into a chamber and dried in consequence of the 
dried or heated air which propels them into the chamber and also, 
owing to the dried and heated state of the chamber into which they 
are thrown. 
The Stauf Process.—The Stauf process represents the first 
commercially successful application of the desiccation of milk by 
Pig. 99. The Stauf milk drier 
the spray-drying principle invented by Percy. The Stauf process 
was patented by Robert Stauf of Posen, Germany, U. S. patent No. 
666,711, January 29, 1901. 
The patent claims are as follows: ‘The process of obtaining 
