26 BULLETIN 744, U. S. DEPARTMENT OF AGRICULTURE. 
after it had traveled about 10 miles from the farm; the milk in the 
can covered with a $-inch felt jacket reached 60° F. after approxi- 
S 
TEMPERATURE, DEGREES F 
~ fu 
Qa i ‘I 
|| TORR 
VEPNLES 
: 
S ae == zz Zo) 35 —ea7 
TIME-HOURS. 
Fic. 19.—Relative efficiency of 4 types of cans in shipment of milk from Washington, 
D. C. to New Orleans. Milk cooled to 44° F. and hauled 13 miles in open truck to 
station. 
or 
mately 268 miles of travel; the milk in the can covered with a 1-inch 
felt jacket reached 60° F. after 332 miles, and that in the insulated 
can after 650 miles. The average air temperature during the journey 
£, OL AREES F*. 
oe 
A 
TEMPER. 
| | | | } } | 
= 7 (2 aes 15 30 70 
Zo es 
TIIE- HOURS 
Fic. 20.—Relative efficiency of 4 types of cans in shipment of milk from New Orleans 
to Washington, D. C. Milk cooled to 40° F. and loaded directly at railroad station. 
was 80° F. Compared with the ordinary can, the $-inch jacketed 
can allowed milk to be shipped 26 times as far before it reached 60° 
