Experiment Station Record, Volume 92, January-June, 1945 Page: 123
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1945] AGRICULTURAL ENGINEERING 123
bale box. The mechanism consists of two prismatic plates, one for each side of
the box, hinged and pivoted for rotation within an opening along the upper part of
the sides of the press box, and means for rotating the plates into horizontal position
to retain the cotton in the bale box during the tramping operation and to, return
the plates to vertical position during the pressing period. Some description of this
device is given and its use is illustrated in a drawing.
Potato storage construction (New Hampshire Sta. Bul. 351 (1943), pp. 1415).-Experiments
with bins holding about 300 bu. each are briefly discussed.
Between a bin equipped with a central flue at the bottom and one in which the
entire bottom was constructed of slats, little difference in loss of weight was evident.
Other bins were so constructed that fall cooling was obtained either by
natural draft or gravity or by use of a suction fan. The fan cooled the bin to the
desired temperature in about 10 days, whereas the gravity method required from
4 to 5 weeks. After the bins were cooled to 38 to 40 F., the flues were closed
to exclude outside air. Each bin had a false partition in the back to circulate the
same air within the bin.
The bins cooled by gravity had an average smaller loss of weight (1.79 percent)
than the one cooled more rapidly by suction fan (2.81 percent), and when the
potatoes in the bin can be cooled in from 4 to 5 weeks the results are found satisfactory.
The storage period covered in this experiment was from 5 to 8 mo.
The tubers selected were free from bruises. Length of storage period had little
effect on the loss of weight, provided the potatoes were cooled reasonably quickly
to about 38 or 40 and held as near that temperature as possible.
In another test on tubers kept in crates during 8.5 mo. of storage so, that there
was free circulation of air around each crate, uninjured potatoes lost 3.08 percent
of their weight and an injured lot 5.68 percent.
Cold storage lockers and locker plants: A list of references, D. W. GRAF
(U. S. Dept. Agr., Libr. List 11 (1944), pp. 32).-This list of references covers
the years 1930 through April 1944. Although it contains some references on the
'handling of frozen foods in locker plants, the list is not considered to be a
bibliography on the frozen food industry. The articles cited deal mainly with
mechanical and structural engineering and accessory equipment.
Temperature drop in ducts for forced-air heating systems, A. P. KRATZ,
S. KONZO, and R. B. ENGDAHL (Ill. Engin. Expt. Sta.. Bul. 351 (1944), pp. 60,
illus. 15).-The detailed investigation here reported upon dealt with such phases
as the heat loss from galvanized-iron ducts carrying heated air and the resulting
drop in temperature in the air flowing in the ducts; the emissivity coefficients for
radiation from the surface of commercial, galvanized-iron ducts; extent and nature
of the temperature stratification of the air flowing and the effect of such stratification
on the heat loss and on the experimental methods required; the effect of
the velocity of the flowing air on the heat loss from the duct and on the drop in
temperature of the air; correlation of the heat transfer coefficients based on the
air films inside and outside of the ducts with similar film coefficients given by
other investigators; and derivation of curves giving the relations between the size
and shape of the duct, the air velocity, and the temperature drop occurring in any
given length of duct. The studies were confined to uninsulated, horizontal, round,
square, and rectangular ducts of sizes and aspect ratios commonly used in forcedair
heating systems. All ducts were freely suspended in the air without interference
from joists or other nearby surfaces.
Brooder fuel substitutes, C. P. HART (Rhode Island Sta. Misc. Pub. 19 (1944),
pp. 5).-Pea coal gave satisfactory results when substituted for chestnut coal in
the proportions of 25 and 50 percent. The mixtures with 50 percent pea coal,
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/136/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.