. Bulletin of the Department of Agriculture. Agriculture; Agriculture. TEMPERATURE CHANGES IN CANNING FRUITS AND VEGETABLES. 51 the temperature changes in the second period. To show clearly the differences that sometimes occur the following experiment was car- ried out. Apples, pumpkin, and sweet potatoes were cut into half-inch cubes. These were placed raw in No, 3 tin cans and enough water added to cover the material. Also, soy beans were packed in cans in the same way and enough water was added to cover the material. These were fOO so \i60 30 t ^^ t>-^ ^^ //- ^ ^**^ ^S»^ A "^
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. TEMPERATURE CHANGES IN CANNING FRUITS AND VEGETABLES. 51 the temperature changes in the second period. To show clearly the differences that sometimes occur the following experiment was car- ried out. Apples, pumpkin, and sweet potatoes were cut into half-inch cubes. These were placed raw in No, 3 tin cans and enough water added to cover the material. Also, soy beans were packed in cans in the same way and enough water was added to cover the material. These were fOO so \i60 30 t ^^ t>-^ ^^ //- ^ ^**^ ^S»^ A "^ ^<\ . JV //i ^^*" ^^ _£ o- ^ // / "â ~-~-~ =«^ :^-:;; ;^ == J ^ ^ '~"^~~ â L-"^ ^°c a 0 '=H 0 6C 1 Q 0 /O 0 /2i 0 /â ; ^o /e o /& O 200 220 Z^O 260 230 300 320 r/M£ /A/ M/NUTES too 90 <^60 to ,50 30 jv^ 7^"^ ^ //' ^ ^^ J^ \'A -<: â^ u //s ;^;~^ / ff A ^'"^ '^^^^ ^ a ' ^ â«M ââ ^^ 1 y 1 1 1 1 â - - r 1 20 'K) eo eo /oo /20 /<^ /eo /eo 200 eao S'i^o 26O £ao 300 320 r/AfS //V M/NUTES. /^O /60 /SO 200 T/flf£ /A/ M/r^UTES 2^0 260 280 300 320 Fio. 55.âTimo-temperature relations for sweet potatoes 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 ; 6, No. 3 tin cans ; c, pint glass jars ; rf, quart glass jars ; x, temperature curve for water bath ; y, teniperatun^ 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 between the end of the curves in B and the beginning of tlie eurv(^s in C. then processed in the water bath for 1 hour. On the following tlay they were processed a second time. Figures 66 and 57 show the results. In the pumpkin very little difference in the time-t«mperature curve for the first and second processing is noted.
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