284 Manuracrurr or Mit,K PowpkR 
as may adhere to the grinding surface. Laffle boards or dash 
boards are provided to receive such of the milk as may splash 
from the cone. 
The patent claim covers the drying of the milk by feeding 
it toa continuously moving, heated surface, where it is permitted 
to form a comparatively thin layer, heating it to evaporate the 
water, and simultaneously subjecting it to a kneading, which 
eradually changes to a grinding action, as the mill solidifies, 
and forms a powder. 
The temperature of the heating surface is recommended to 
be that of boiling water, but may be between 212 degrees I. and 
4 
270 degrees F. ‘The milk enters the hopper without preheating 
and without other treatment. 
The Passburg Process.—Jhis process was invented and 
7] 
pS 
SS 
Nae) 
ames sae 
P ft 0 iL 4 | = 
el | 
Fig. 95. The Passburg milk drier 
patented by Emil Passburg of Berlin, Germany, U. 5. patent 
No. 726,742, April 28, 1903. “This film dryer operates under 
reduced pressure. It consists of an outer casing (A) in which 
revolves one steam heated, metal drum (‘I'), an automatic milk 
