COLORING CITRUS FRUIT IN FLORIDA 17 
COLORING UNDER CANVAS TENTS 
Canvas can be used in the construction of coloring rooms; and, 
if the entrance is carefully closed and the tent is tight to the ground 
or floor, the gas will be retained in the room and a fairly high 
humidity can be main- 
tained. The tempera- 
ture is, of course, un- 
even in such a struc- 
ture, because the can- 
vas has little insulat- 
ing value and changes 
in the outside tempera- 
ture are readily trans- 
mitted to the interior 
of the room. ‘This 
material also is highly 
inflammable, making 
the use of stoves un- 
safe without placing 
each in a metal box 
such as is shown in 
Figure 10. Expert- 
ments in coloring un- 
der canvas were con- Sozoes 
ducted in April, 1923, 
and it was found that 
it required a little more 
time to bring the fruit 
to full color in tents 
than in the ordinary 
double-walled color- 
ing rooms. A com- 
parison of the tem- 
perature and humid- 
ity inside and out- 
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Fic. 11.—Diagram showing the construction of a float 
valve for the regulation of the level of kerosene in 
urners 
side a canvas coloring tent during operation is shown in Table 5. 
In this instance the gas was supplied from an outside generating 
room. It is noticeable that the temperature within the tent follows 
very closely the outside temperature and that the humidity is in- 
clined to be lower than is desirable for the best results. 
TABLE 5.—Comparison of temperature and humidity inside and outside a 
tent filled with fruit and supplied with gas 
Relative hu- 
Temperature cae 
Cx Peake 
Time 
Out- Out- 
In tent side In tent side 
Masi 2 SEEPS 76 72 82 65 
Bolas im.) 8) 80 76 75 61 
HOlas mes 252 oi 2 80 71% 75 65 
TG i eee ere 82 80% 69 58 
1:25 06 Vie Nae ae ead 82 83 69 52 
1S [05500 apa ean 85 85 60 47 
Relative hu- 
ake midity (per 
5 cent) 
Time 
Out Out- 
In tent side In tent side 
2 pee - Wwe 86 88 60 46 
Siplmmge eee 87 88 57 46 
4pm. 22 oh... 89 89 55 46 
Bap imide he 87 87 57 45 
Gipiimse as sees 86 87 63 45 
gD ee se es 80 73 83 86 
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