166 U. S. BUREAU OF FISHERTES 
the oil content of the bath is allowed to increase and the other to show the effect 
of removing the increase after each unit is fried, so as to keep the oil content 
constant. It was assumed that 0.180 pound of oil cooked out of each 4 pounds 
fried, and that 0.140 pound was removed by each 4 pounds fried. Enough of 
these calculations are given in Tables 22 and 23 to show the trend of affairs. 
It is realized that these calculations are partially based upon assumptions 
and approximations, yet it is felt that they are not far from the truth; if anything, 
they are too low. In any ease, they accurately show the nature of the changes 
that take place and clearly indicate how the sardine-oil content of the frying 
oil can be kept at a minimum. Experimental evidence tending to substantiate 
these calculations follows: 
TaBLE 20.—Calculated fish-oil content of fry-bath oil 
[Four-pound units fried; oil content constant at 12 pounds] 





Pounds | Per cent Pounds | Per cent 
Frying time in | Pounds | of fish | fish oil in || Frying timein | F04DGS | of fish | fish oil in 
hours fried oil in fry-| fry-bath hours fied oil in fry-| fry-bath 
c bath cil oil ae bath oil oil 
Ong5 eee A 4 0. 138 17°D'|| Sip5os see a Tay 120 3. 526 29. 4 
C250 eee 8 275 243) | 5000 bes Shee 160 4. 454 37.1 
(ey peaes eee 12 410 8543|(K6:250sn 5 = ele ae ry 200 5. 280 44.0 
GA 1) ae ail prelates 16 . 544 Asal 6 | a eae el 400 8. 235 68. 6 
(G25 ee eee Nee 20 . 676 BSG: | |B! 750. ee a 600 9. 890 82.4 
(ee eee eg 40 1.314 LOMO 25000 ee is: es 800 | 10.816 90. 2 
00M ee, eed 80 2. 484 20.7 



TaBLE 21.—Calculated fish-oil content of fry-bath oil 
{One-pound units fried; oil content kept constant at 12 pounds] 





Pounds | Per cent Pounds | Per cent 
Frying time in | FOUdS | ‘of fish | fish oil in |] Frying time in | FOUnds | of fish | fish oil in 
hours fried oil in fry-| fry-bath hours fri Fal oil in fry- | fry-bath 
| bath oil oil ; bath oil oil 
Ue ne eee ae 4 0. 139 US (CQO = Boe See a 16 0. 546 4.6 
1 epee a teres ae 8 . 276 Qed oes as a5 ose 20 . 679 5.7 
Tetra e ee ee ee BESS 12 . 412 3745 Roe aaa eee eee 40 1.319 11.0 





TaBLE 22.—Calculated fish oil content of fry-bath oil 
{Four-pound units fried; oil content increasing from 12 pounds at start] 

Pounds 
sardine 
Pomnes Calculations oil in 12 
: pounds of 
fry-bath oil 


(0.180) 12.0 





4 12 = 0.177 
E 12.180 12. 040 
(0.177+-0.18) 12.0 
8 12. 040X x = - 352 
12. 180 12. 040 
(0. 352-+-0.18) 12.0 
12 12. 040 X x = . 524 
12. 180 12. 040 
(0. 524+-0.18) 12.0 
16 125030 = - 694 
12. 180 12. 040 

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