Silos and Silage in Colorado. 
49 
SHEET IRON FOR FORMS. 
Diameter Circumference Sheet Iron. 
10 feet Inside 31.41ft.—4 pieces 8 ft. long. 
Outside 34.03 ft.—4 pieces 8 ft. long, 1 piece 2 ft. 8 in. long. 
12 feet Inside 37.70 ft.—4 pieces 9 ft. 8 in. long. 
Outside 40.22 ft.—5 pieces 8 ft. long, 1 piece 1 ft. long. 
14 feet Inside 43.98 ft.—4 pieces 11 ft. 2 in. long. 
Outside 47.12 ft.—6 pieces 8 ft. long. 
15 feet Inside 47.12 ft.—4 pieces 12 feet long. 
Outside 50.27 ft.—6 pieces 8 ft. long, 1 piece 3 ft long. 
16 feet Inside 50.27 ft.—4 piece 12 ft.9% in. long. 
Outside 53.4 ft.—7 pieces 8 ft. long. 
18 feet Inside 56.55 ft.—4 pieces 14 ft. 4 in. long. 
Outside 59.69 ft.—7 pieces 8 ft. long, 1 piece 5 ft. long. 
20 feet Inside 62.8 ft.—4 pieces 15 ft. 11 in. long. 
Outside 65.97 ft.—8 pieces 8 ft. long, 1 piece 3 V 2 ft. long. 
(For incidental material and scaffolding obtain building instructions.) 
REPORT ON CONSTRUCTION OF PIT SILOS AT THE 
PLAINS SUBSTATION. 
By J. W. Adams, Superintendent. 
During the summer of 1912 two pit silos were made at the 
Plains Substation, located at Cheyenne Wells. These silos are ten 
feet in diameter, one is twenty-three feet deep and the other is 
twenty-eight feet deep. 
It was the purpose to make these silos as cheaply as was con¬ 
sistent with efficiency, durability and safety. 
To insure durability and efficiency, a concrete ring was put at 
the top of the ground and great care was taken to keep the walls 
smooth and perpendicular. Care was also taken to do a good job 
of plastering and brush coating the walls. To make the pits safe, 
that is, to prevent the! danger of stock or people falling into them, 
we built a wall of adobe ten inches thick and three feet high around 
each. These adobe walls are cemented and form a part of the silos. 
(For method of making adobe walls see Bulletin No. 174 of this 
station entitled, “Adobe as a Building Material for the Plains.”) 
These silos have proven so satisfactory in every way that two 
more were put in the past winter (1913-1914). These are twelve 
feet in diameter and twenty-six feet deep. 
Method of Construction. 
In constructing these silos the first operation was to bore with 
a test auger a hole in the center of silo as deep as the silo was to be. 
A pipe was put in the hole and using it as a center, two circles were 
marked on the ground. The inner circle was the diameter of the 
silo plus one inch, one inch being allowed for plaster. The outer 
