MANUFACTURE OF MiLK POWDER 289 
along one side for the automatic removal of the surplus milk not 
taken up by the drum. ‘To the bottom of this casing is supplied 
a quantity of milk. This is pumped to the supply pan under the 
drum, the overflowing milk running back into the lower portion 
Fig. 98. The Buflovak vacuum drum drier 
Courtesy of Buffalo Foundry & Machine Co. 
of the casing. There is slight pressure in the supply pan which 
causes the drum to take up a heavy and even coating. Near 
the supply pan is installed a leveling arrangement which levels 
off and equalizes the layer of milk on the drum. As the drum 
