172 Continuous PROCESS EVAPORATORS 
of the concentrator and carries a pulley hack of the rear head, 
to which the power is transmitted. 
The rear of the concentrator terminates in the exhaust 
chamber of the condensed milk vapors, which escape through a 
galvanized iron flue to the outside. ‘Phe vapors are not con- 
densed by water, but escape into the atmosphere. The rear wall 
is equipped with the intake of the fluid milk. In order to permit 
the milk to feed the concentrator by gravity, without necessitat- 
ing inconveniently high elevation of the forewarmer, the intake 
is located at the bottom. 
In the front head, in close proximity to the periphery of the 
concentrator is located the outlet of the condensed milk. Its 
distance from the inside wall of the concentrator determines the 
thickness of the film of condensed milk that is allowed to form 
on the heating surface, and the amount of milk that 1s retained 
in the concentrator. According to the amount of superheating 
intended, this film may vary from { to $ inch in thickness and 
the amount of milk retained in the machine may vary from 6 
to 12 quarts. 
The front head is equipped with a cover which is fastened 
to the rim with screw bolts and which carries a spy glass through 
which the operator may watch the process. At the conclusion 
of the operation this cover is removed and the dasher and blades 
are taken out, so that both the shell and the dasher can be 
readily washed. Over the top of the concentrator exterids the 
steam line. a 3 inch pipe, with 14 inch laterals, supplying the 
steam jacket, and insuring uniform distribution of heat. The 
steam line is also equipped with regulator and steam gauge. At 
the bottom of the concentrator is located the exhaust and regu- 
lating Crip valve. 
The continuous concentrator is constructed of diverse sizes 
and capacities, the most common of these sizes are the following: 
\Capacity per Hour ; oa 
Diamete Length when Concen- a ules 
: 3 vene trating at the iP 
ee ee Kees Ratio of 3:1 __ Ss = 
3 feet 4+ feet 7000 Ibs. LOO CHER: 
3 feet 3 feet 5000 Ibs. 80 H. P. 
3 feet 2 feet 2000 Ibs. 40 H. P, 
