KK1TJGERATI0N OF FISH 



577 



(See fig. 27.) This brine was pumped over the boxes of fish as in 

 the original invention. 



In a later improvement Dahl 42 stood the eases on end and bored a 

 hole in each end. The fish in the cases then standing parallel with the 

 downward flow of brine afford a better flow and are more thoroughly 

 exposed to the refrigerating; action of the brine. 



Dahl patented another improvement 43 by way of effecting a better 

 distribution of brine among and contact with the fish. He first 



Fig. 28. — Small plant for freezing by Dahl method. The fish 

 are put in the boxes and brine pumped in through the 

 hose 



inserted a brine-discharge hose among the fish, for a short time, to 

 stiffen them, after which operation they remain better separated dur- 

 ing the subsequent freezing by the brine flowing among them. 



The fish frozen by Dahl's process are not glazed and appear to be 

 more suitable for shipment and consumption after a short time than 

 they are for prolonged storage. Installations of apparatus for freez- 

 ing on the Dahl principle have been made at Los Angeles, San Diego, 

 and San Francisco, Calif. These consist of the brine-forming com- 



« U. S. Patent 1235661, Aug. 7, 1917 : British Patent 109238. Sept. 6. 1917. 

 43 U. S. Patent 1367024, Feb. 1, 1921. 



