APPLICATION OF EEFEIGERATION TO HANDLING OF MILK. 
63 
leaks occurring in production due either to careless operation or 
to deterioration of the apparatus and is able to judge of the exact 
value of every movement in the process. 
REQUIREMENTS OF REFRIGERATING PLANTS FOR DAIRY PURPOSES. 
A refrigerating plant suitable for use in milk plants, creameries, 
and dairies should comply with the following requirements : 
(1) It should be reasonable in cost. 
(2) Economical to operate. 
(3) Reasonably sure against breakdown. 
(4) Should produce cool and dry air in storage room. 
(5) Should produce lower temperatures than ice. 
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Fig. 30. — Approximate cost of producing refrigeration in the average creamery with belt-driven 
compressors. 
(6) Should give perfect control of temperatures. 
(7) Should be simple in construction and operation as to require 
little attention and be successfully operated by any careful person 
without any special mechanical or engineering skill. 
(8) Should occupy little space. 
The initial cost of a refrigerating plant should of course be as 
small as possible consistent with high-grade apparatus. It is 
believed that no class of machinery depends more for satisfactory 
and economical operation on the original design, material of con- 
struction, and workmanship than refrigerating machinery. An 
inferior grade of refrigerating apparatus is an expensive investment 
at any price and should never be installed. With high-grade machin- 
