UTILIZATION OF WASTE SEED FROM THE TOMATO. 
17 
Table V. — Expeller tests of various lots of tomato seed dried in rotary and 
tray driers. 
Kind of seed. 
Weight of product (pounds). 
Seed 
Oil ob- 
tained. 
Foots. 
Net results (per 
cent). 
Oil. 
Oil and 
foots. 
Rotary drier: 
Normal 
Fermented 
Heated 
TJncleaned 
Tray drier: 
Normal 
Fermented 
67.5 
50 
73.25 
20 
63.75 
81.25 
10.25 
10.25 
2.75 
12.0 
15 
Trace. 
1.75 
Trace. 
Trace. 
Little. 
1.75 
15.1 
16 
14 
IS. 4 
15.1 
19.5 
14 
13.7 
18.8 
20.6 
The yield of oil ob- 
tained from the several 
lots of seed varies con- 
siderably, but it is noted 
that neither fermenta- 
tion nor heating of the 
seed previous to drying 
had any material effect 
in decreasing the yield 
of oil. Neither can it 
be concluded from the 
results obtained that the 
seed dried in the tray 
drier produced a higher yield of oil than that dried in the rotary 
drier. The apparently higher yields are explained by the fact that 
before the tray-dried seed was run through, the expeller had been 
operated for several hours, thus causing a higher temperature, due 
to the heating of the barrel. Furthermore, the adjustments neces- 
sary for the efficient operation of the expeller with this particular 
material had been perfected when the tray-dried seeds were passed 
through. A yield of about 17 per cent of oil can therefore be ex- 
pected from tomato seed by means of a perfectly adjusted expeller 
operating at its greatest efficiency. 
Fig. 10. — A commercial oil expeller. 
