UNIVERSAL PORTLAND CEMENT CO. 
67 
work in the forms must be protected for several days with manure, straw 
or a canvas jacket under which hve steam is run. 
The table below shows the approximate cubic yards of concrete 
required for the walls of monolithic silos of various sizes, with continuous 
doors, and walls 6 inches thick. The table on page 68 shows the quantities 
of cement, sand and gravel or stone required for silo walls, using 
Jiaterials proportions of 1 sack of cement to 2}^ cubic feet of sand and 4 
cubic feet of screened gravel or crushed stone. It can hardly be 
expected that these tables will be exact in all cases, as the difference in 
sand and gravel used, as well as other considerations, affect the quantities 
of materials to a considerable extent. These tables are accurate to within 
10 per cent. 
Table Giving Cubic Yards of Concrete Required for Walls of 
Monolithic Silos with Continuous Doors 
For additional amounts required for Foundation, Chute and Roof, see Pages 55 and 89. 
Walls 6 Inches Thick 
Height of 
Silo in 
Feet 
INSIDE DIAMETER OF SILO IN FEET 
10 
12 
14 
16 
18 
20 
26 
28 
30 
32 
34 
36 
38 
40 
42 
44 
46 
48 
50 
52 
54 
56 
58 
60 
14 
68 
15 
81 
19 
07 
16 
94 
20 
43 
18 
07 
21 
79 
19 
20 
23 
15 
20 
32 
24 
51 
21 
45 
25 
87 
22 
58 
27 
23 
28 
59 
29 
96 
31 
32 
32 
68 
34 
05 
25.52 
27.11 
28.70 
30.30 
31.89 
33.49 
35.08 
36.68 
38.27 
39.86 
41.46 
43 . 05 
44.65 
46.24 
47.84 
29.24 
31.06 
32.89 
34.72 
36.55 
38.37 
40.20 
42.03 
43.85 
45.68 
47.51 
49.34 
51.16 
52.99 
54.82 
35.02 
37.08 
39.14 
41.20 
43.26 
45.32 
47.38 
49.44 
51.50 
53.56 
55 . 62 
57.68 
59.74 
61.80 
41.27 
43.56 
45.85 
48.15 
50.44 
52.78 
55.02 
57.32 
59.61 
61.90 
64.19 
66.49 
68.78 
To release the inner form, drive out the keys and if need be, remove a 
few of the bolts. Slide up the inner form on the upright supports and secure 
in the new position by the bolts passed through the supports 
Moving up just below the form, as previously explained. The inner form will 
forThe ^® bolted together again and the keys driven into place. 
Next Course After attaching horizontal reinforcing rods to the vertical rods 
for the second course, the bolts in the outer form are loosened 
and the form raised by means of ropes attached to wire handles and run- 
