SHIPPING MILK AND CREAM 129 
may be placed immediately after cooling and in which 
they may be kept until ready for shipment. 
Shipping in Cans. Various insulated cans are now 
upon the market and a number of these have been tested 
by the author. The tests showed that these cans possess 
about the same insulating effect as the felt jackets that 
are commonly 
wrapped around ordi- 
nary milk cans. Since 
the latter, as a rule, 
are more durable and 
more easily handled, 
they will be found 
more __ satisfactory 
when wrapped with a 
felt jacket than the so- 
called insulated ship- 
ping cans. 
When milk and 
cream are cooled close 
to freezing and placed 
in ordinary milk cans 
wrapped in felt jack- 
ets, they may be safe- 
ly shipped to any 
point that may be 
reached within 
24 hours even Fig. 46.—Screw Top Can. 
in warm weather. 
If the temperature of the milk and cream at the time of 
shipment is 50° F. or higher, then long distance ship- 
ment is best accomplished by the use of an ordinary can 
placed inside of a covered ice cream shipping tub con- 
taining ice. Such a tub has practically the same in- 
