REFRIGERATION AND FREEZING OF FISH 



351 



(1) an ammonia line, (2) a "Freon-12" line, or (3) a refrigerated brine line. The 

 machines are equipped with an accumulator, which is an automatic device for 

 maintaining the packages on the plates under uniform pressure. This pressure may 

 be adjusted to any point between 1 and 10 pounds per square inch; the usual 

 pressure on the packages is 4 pounds per square inch. Even though an automatic 



^,L\'iirtcsy Amciio Inc.) 



Fig. 16-9. Jackstone plate or Amerio plate freezer. 



device is provided to maintain controlled pressure on the packages, wooden 

 spacers Ys inch less in thickness are provided along 2 edges of the plates. This 

 permits the freezing of products in relatively flimsy packages. The plates are 

 raised and lowered and the pressure is applied to the plates by means of a 

 hydraulic jack which has a 6-inch I.D. cylinder. 



The freezers are all of sturdy construction. The outer frame is independent of 

 the inner one, and is constructed of 6-inch steel I-beams. The outer case is con- 

 structed of 18-gauge sheet steel. The inner freezer frame has 4 steel uprights, 

 each of 3-inch channel steel. There is 6 inches of lightweight "Fiberglas" between 

 the outer sheet steel and the freezer proper. The double doors which open out are 

 insulated with 5 inches of lightweight "Fiberglas." 



"Jackstone Roto Froster." Another freezer for fish, which freezes by conducting 

 heat simultaneously from both sides, has been invented by Stone. This freezer, 

 known as the "Jackstone Roto Froster," consists of an insulated cabinet containing 

 24 pairs of freezing plates, which are mounted in a substantially parallel position 

 and radiate out from and are attached to a revolving drum axis. As the drum 



