TEMPERATURE CHANGES, ETC., DURING CANNING OPERATIONS. 28 
different initial temperatures on the rate of temperature change in 
a No. 2 can of string beans packed rather closely and processed at 
ayia eee 5 
\A;, 
WU 
TEMPERATURE IN PMEGREES CENTIGRADE 
3 
TIME: IN MINUTES 
Fic. 10.—Experimental time-temperature curves for No. 2 cans of string beans, starting 
at different uniform temperatures and processed at 116° C. Curve is also shown for 
cooling in water at 25° C. Curve for can starting: A, At 23° C.; B, at 40° C.; C, at 
nee eGo rat iO C,.. Bt, at 80° -C.3 G,:at 90° C.5.., at 100% C.; xX, at 
116° C. and cooled in water at 25° C. 
116° C. The cooling curve for a No. 2 can cooled in water having a 
constant uniform temperature of 25° C. is also given. 
Lt _ 
ot 
MPERATURE IN DEGREES CENTIGRADE 
To 6h a ee 
eee es eee 
ee ee 
TIME’ IN MINUTES 
Fic. 11.—Experimental time-temperature curves for string beans in quart glass jars, 
starting at different uniform temperatures and processed at 100° C. Curve for jar 
marge. A. At 20° ©.: B, at 40° C.; 0, at 60° C.3 D,. at 80° C.5\H, at 90° C. 
In figure 11 aré shown the experimental heat-penetration curves 
for beans in a quart glass jar processed at 100° C. 
