148 U. S. BUREAU OF FISHERIES 
from one sprocket to the next, at the other end of the tunnel. The 
following arrangement is suggested for 12 lines of flakes in a tunnel 
12 feet high; 18 inches for the first line and 16, 14, three 12, and six 
10 for the others. The purpose of such an arrangement is to give 
more air to the cooler flakes in order to raise the temperature of the 
fish quickly, so that rapid moisture loss will be brought about. A 
few well-placed baffles over each line of flakes (and this applies to 
the cooler, too) should be provided to assure good air distribution. 
In the cooler, however, the lines of flakes should be spaced equally. 
Although drip pans are not needed under all the lines fer catching 


SECTION A-B. 
Fic. 27.—Plan for handling flakes 
drippings, some means of dividing the main tunnel into smaller 
ones, through which each line of flakes passes, should be used. For 
instance, should there be 12 lines of flakes in the cooler, the fish 
would be treated with 12 different lots of cool air. This arrange- 
ment should be very effective. 
In the cooker any mixing of the air that passes over one line of 
flakes with that of another (for instance, around the sides of the 
drip pans) will be helpful, in that it will tend to equalize the tem- 
perature throughout the cooker. In the cooler, however, the par- 
titions that separate the various lines should be tight enough to 
prevent much mixing of air, as better cooling will be effected if air 
