TEMPERATURE CHANGES IN CANNING FRUITS AND VEGETABLES. 49 



During the first processing there was a very rapid rise in tempera- 

 ture, The No. 2 tin can was fastest, with the No. 3 tin can next, then 

 the pint glass jar with the quart glass jar slowest. The temperature 

 approached 100° C. promptly, thus subjecting the material to that 

 degree of heat for a considerable length of time. The cooling was 

 rather slow, the pint jar being fastest, the quart jar next, then the 



20 <W 60 ao /OO /20 



/*?0 /60 /30 200 220 2<?C 2GO 2BO 300 32G 

 T/ME /A/ M/NUTES 



/OO 



90 

 (jSO 



ft TO 



\ 6 ° 



(3* 



he 



^>go 



iO 





60 SO /OO /20 /<?0 /SO /<SO 200 220 2<?0 260 2SO 30O 320 

 T/ME /N M/NUTES 



VC 







































>~* 



^ 































^ 



5 ~^3 



^ 



-— ■— 

























'\# 



r 





^ 



























w b 















J^ 



. £___ 

































































^^ 











__ 















..JL-. 























c 





























































20 <?0 60 GO /OO 



/^O /SO /GO 200 220 2*?0 260 280 <300 320 

 T/ME /A/ A//A/C/TES 



Fig. 54. — Time-temperature relations for soy beans (Easy Cook) in various containers 

 when processed for 1 hour on each of three successive days (the intermittent process) 

 at 100° C. in the boiling-water bath: A, First day; B, second day; C, third day; 

 a, No. 2 tin cans ; b, No. 3 tin cans ; c, pint glass jars ; d, quart glass jars ; x, tempera- 

 ture curve for water bath ; y, temperature curve for room. The interval between the 

 end of the curves in A and the beginning of the curves in B was 18 hours and 40 minutes. 

 The same period of time elapsed between the end of the curves in B and the beginning 

 of the curves iu V. 



No. 2 tin can, with the No. 3 tin can slowest. The temperature fell 

 to 60° C. in about 1 hour and 15 minutes in the pint glass jar, in 1| 

 hours in the quart glass jar, in 1 hour and 35 minutes in the No. 2 

 tin can, and in 2 hours in the No. 3 tin can. The temperature re- 

 mained between 30° and 40° C. in the different containers as fol- 

 lows : Pint glass jar, 1-J hours; quart glass jar, 1 hour and 45 minutes; 



