154 



vStorac.iv 



Fig. 53. The Stevenson cold storage door 



CciiiTte.^\' of Ste\X'Uson Co. 



The sweelcncd cunclcn.sed milk (loe.s not fi'cezc, l)ccause it 

 cniitains so cmiceiUraled a su|_;ar snlutinn tliat its freezing- point is 

 usually far helovv the refrii^er- 

 atinq- teniperalure. if it is 

 packed in solder-sealed cans L 

 there is usually no had effect 

 from cold storage. Iliiwever, 

 when packed in cans sealed 

 with the friction ca]) or the 

 hurr cap, difficulties ma\' arise. 

 These seals are not air-ti,!.^iil. 

 Excessively lo^v stora.Q'e tem- 

 peratures cause the contents lo 

 shrink apprecialil)-. Suction is 

 formed and air is drawn in 

 through the seal. \\'lien these 

 cans again warm up, Ihe ^-is- 

 cous milk in the cans seals the microscopic openings, the air and 

 the liquid expand hut the air hnds ncj exit. This causes the cans 

 to swell. While the tpiality of the milk in these cans is not 

 im|)aircd in the least, the swelled cans suggest gaseous fer- 

 mentation, A\diich means spoiled milk and which is in\'ariably 

 rejected on the market. 



The temperatures at which condensed milk can be stored 

 n-ith least objectionable results, range between 32 and 50 de- 

 grees F. 



Advisability of Storing. — A heavy stock of condensed milk 

 is a severe drain on the w'orking capital of the condensery in- 

 \'oh'ing the cost of the fresh milk, cane sugar, tinplate, boxes, 

 solder, labels, coal and labor. 



Unless the manufacturer has successfullv overcome and mas- 

 tered all of the principal condensed milk defects, and, unless his 

 experience justifies him in beliex'ing that his goods will stand 

 the trials of storage, he will find it advisable not to manufacture 

 more than he can promptly dispose of. Even at best, the con- 

 densed milk \\'ill be from three to six months old before it is all 

 consumed, and, if it is at all subject to deterioration, the sooner 

 it is consumed the better. 



But even if the condensed milk comes out of storage in good 



