MANUFACTURE OF MILK PowpbER 293 
In this apparatus the spray of the milk enters into the upper 
part of the drying chamber and is permitted to drop through an 
atmosphere of heated air. As the atoms of drying milk descend, 
they surrender more and more of their moisture and at a certain point 
toward the bottom they have discharged substantially all their mois- 
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Fig. 100. The McLachlan milk drier 
ture and are deposited in the form of a dry powder in the bottom 
of the drying chamber, from where they are discharged by a slide 
door. In the meantime the vapors pass freely up and out of the 
upper or open end of the chamber. 
This process differs from the Stauf process essentially only in 
the fact that the milk descends through an atmosphere of heated air 
and that the drying chamber and the collecting chamber are one and 
