CARRYING QUALITIES OF EXPORT CORN. 41 
directly under the hatches, where it had a plank covering. In hold 
4, five thermometers were placed in the corn the same height as the 
top of the tunnel, as is illustrated in figure 26. Thermometer 36 was 
located on the steel side of the ship, where the temperature varied 
with and was always about the same as that of the sea water. 
Two thermometers were placed halfway between the tunnel and the 
outside, thermometer 34 on the port side and 35 on the starboard side, 
and the temperature of the corn in both of these positions remained 
practically the same throughout the whole of the voyage. The two 
remaining thermometers were placed on the tunnel, thermometer 32 
on the unprotected steel part and 33 on the plank protected part. 
The temperature records for thermometers 32 and 33 show that the 
temperature next to 
the tunnel remained i [mca am 
unchanged until the EEE 
ship began to sail at 
the beginning of the 
voyage, after which 
there was an imme- 
diate and rapid in- = — seerees Seiad 
crease during the 
TEMPERATURE °F 
& 
next seven days, Wy 
reaching a maximum ao Sats ® Se He 
a SO ots AS 2 ry * 
of 95°F.onMarch10. 4 §& x ee ga 
: : : Ry S ss 9 
= 2 § Sho? = 
During thisperiodthe zs 8 § eee ee SNE Sis hastsoon AO 
com thatwaslocated 33 123 28< es --|7*.1 | Peraagdgeoc cnr] 88 262 186 32 
; 36 186 24.6 74 -- ge 2 Eo", SBzegs----4-- $9 264 182 35 
against the steel part cake i 
of the tunnel was the 
first t h aia Fia. 26.—Hold 4: Temperature records of the electrical resistance ther- 
: St to Show a raplc mometers and ‘‘trap” samples located at the height of the top of 
increase, and also the the shaft tunnel. Samples secured in Denmark. Heavy shading 
; 3 represents heat-damaged corn. (Cargo No. 2. 
greatest daily in- 
crease, in temperatures. After March 10 there was a decided drop in 
both the air and water temperatures, and also a corresponding drop 
in the temperature of the corn next to the tunnel. The corn, how- 
ever, remained above 80° F. until April 1, after which there was again 
a decided drop in temperature corresponains to the drop in fhe air 
and water temperatures at this time. The corn located against the 
steel part of the tunnel was, however, in this case the first to show 
the decrease, and also showed the greatest daily decrease, a condition 
which was just the reverse of that at the beginning of the voyage. 
This illustrates the fact that the unprotected steel tunnel is a better 
conductor of heat than when it is protected by a plank sheeting. 
During practically the whole of the voyage, the temperature of the 
corn stowed next to the tunnel was over 20 degrees higher than the 
temperature of the corn stowed halfway out from the tunnel. 
