202 U. S. BUREAU OF FISHERIES 
TaBLE 39.—Change in drying rate of raw California pilchards with respect to time 
[Average difference for experiments included] 




Intervals of time Length of 
Experiments included intervals, 
First | Second | Third | Fourth: | Suauies 
BZ LO en ee 3.4 1.2 0.9 1.0 30 
DIMES oe 8 SE 8 8 es ee ee 8.8 3. 2 2.7 2.0 15 
TGS ee SE ee ee 8 eee eens 5.2 2.8 2.1 2.0 15 

Effect of fish size upon the drying rate.—The data given in Table 40 plainly show 
(when considered as a whole) that large fish lose their moisture more slowly than 
small ones when dried under identical conditions. 
Temperature rise in fish being dried.—Numerous data upon the temperature 
rise in fish undergoing drying were obtained during the course of the experiments. 
These are given in Table 41. The temperatures were obtained by placing the 
bulb of a thermometer about one-eighth of an inch under the skin of a fish at 
its thickest part. The fish was then kept in the path of the drying air. Readings 
were taken from the stem of the thermometer, which extended through the 
drier housing. 
Tasie 40.—E ffect of fish size upon the drying rate. 










Average Per cent loss in weight (time in minutes) 
weight of 
Experiment No. iudivid | 
ual fish in 
grams 10 | 15 20 30 45 60 
W225 ees oe a eee ek ae es eee 11 (Si Peete 11.2 COS Eee eee = 
TAD IA. 20 t BOT AG A LAD 1S oe EES OHA ie 2k 130 |. Se eee IS 
DS Seah ee op ya Phy. OPES) epee Baie 19) 2 Loewe badeee elt eae ds 2 10: 6 ecece es] 3228 Se 
10h er ann Seek ee eer Rear ee ee 3 0 | ee ee | ee eee (PUN pee Ss | pmeeee ser 
MQM ie se eres so sos SS or aan en eee OO eee | meme = | eee Sa ip a ee 4 fe 
A2Sal Je Set Ih a oe S93 pees aera S Sees cee SOs 2. ee Ol ¢ | see ‘Toy hore 8 3 | Bees 
US ae a pe Se ene ee ee AQ KEL ae ee Let Seen 10. 1 12.7 14.8 
GS ae oe oe ie ee ne eae 44 | == 6, 0)|2- ane o 8.6 10.9 13.0 
T20aee 6 Se Sa SS ee | eee Ora) panne ees 8.8 11.0 12.9 
UG De 22a ok so Us SS se 5 5iQG)S Sse 8.1 10.0 12.0 
1 20G Rae See Sa eee ee ee ee ee MeN ee ee 4. OMS seers 6.3 8.2 10. 4 
WO bs eet hers he ee. ees se aol D0 )a3ee 2 4, Qyjeee5- 7.1 8.5 10.7 
MGGS: 252 ooo ee see eee ne eae eS OO El Se ace, SH) ae eee 7.7 10.0 11.6 
U1 Saree as Se ens ee ae ae es ees LA eats Ss acres Flere Give | aes 10.3 
D9 @8 ene Se eS oan eae sees eal O6i/¥* 20 | See see ees 6.8 a ee 
MISO is= ek ee ee bee eee Le ene emer ral (em s~ eee 65:0 Sasa 10.3 
UTI Yo ain ell tila ME ap Ree nord Th ET LO Meee Niele: BE HY meee 2a 10.7 
1 Ie eee ee eee ae ee eee SE, ee ee eee 1 OA) ae el eee jee ee Ore" |2=s2aeee 8.3 
URE Se ee ae ee c rf | Wl Q ed tiee| se seoradleeotiest & 6:9) |f2s=25ee8 10. 2 
| 
1 All other variables were constant, axeept't for ae negligible variations in vapor pressure. The fish, 
however, in addition to differences in weights, were, in a number of cases, from different lots. 
