Thirty-fourth Annual Convention. 



217 



Table 1. — Approximate Capacity in' Tons of Cylindrical Silos of Different 

 Diameters and Depths, Computed from King's Table. 



(The diameter is shown at the top of the columns and depth at the 

 left.) 



Inside Diameter in Feet. 



Ft. 10 11 12 13 14 15 16 17 18 19 20 21 22 



20 26.2 31.6 37.7 44.2 51.2 58.8 67 75.6 84.7 94.4 104.6 115.3 126.6 



21 18.0 33.8 40.3 47.2 54.8 62.9 71.6 80.8 90.6 109.9 111.8 123.3 135.3 



22 29.9 36.2 43.0 50.5 58.6 67.4 76.5 86.4 96.8 107.9 119.6 131.8 144.7 



23 31.9 38.6 45.9 ■ 53.9 62.5 71.7 81.6 92.1 103.3 115.1 127.5 140.6 154.3 



24 33.8 40.9 48.7 57.2 66.3 76.1 86.6 97.8 109.6 122.1 135.3 149.2 163.7 



25 35.8 43.3 51.6 60.5 70.2 80.6 89.6 103.6 116.1 129.3 143.3 158.0 173.4 



26 37.9 45.9 54.7 64.2 74.4 85.5 97.2 109.8 123.0 137.1 151.9 167.5 183.8 



27 40.1 48.5 57.7 67.7 78.6 90.2 102.6 115.8 129.8 144.7 160.3 176.7 194.0 



28 42.2 51.1 60.8 71.3 82.7 95.0 108.1 122.0 136.8 152.4 168.9 186.2 204.3 



29 44.4 53.7 63.9 75.0 87.0 99.9 113.7 128.3 143.9 160.3 177.6 195.8 214.9 



30 46.6 56.4 67.2 78.8 91.4 105.0 119.4 134.8 151.1 168.4 186.6 205.7 225.8 



31 48.8 59.1 63.3 82.5 95.7 109.8 124.9 141.1 158.2 176.2 195.2 215.3 236.3 



32 51.1 61.9 73.2 86.4 100.2 115.1 130.9 147.8 165.7 184.6 204.6 225.5 247.5 



33 53.4 64.6 69.9 90.3 104.8 120.5 137.8 154.6 173.2 183.1 214.1 235.8 258.7 



34 55.8 67.5 80.3 94.3 109.3 126.0 142.8 161.6 180.8 201.7 223.6 246.2 270.0 



35 58.2 70.4 83.7 98.3 114.0 131.6 148.9 168.7 188.3 210.5 232.2 256.8 281.5 



36 60.6 73.0 86.9 102.2 118.3 136.3 154.7 175.0 196.3 219.4 242.0 207.5 292.1 



37 63.1 76.0 90.4 106.1 123.1 142.1 160.8 183.2 204.3 228.0 251.9 278.4 303.9 



38 65.5 79.0 94.0 110.3 127.9 148.0 167.0 190.7 212.4237.2 261.9 289.4 315.9 



39 67.9 82.0 97.3 114.5 132.8 154.0 173.5 198.3 220.6 246.5 272.0 300.5 328.1 



40 70.3 85.1 101.1 118.8 137.8 160.1 180.0 205.0 228.9 225.9 280.2 311.8 340.4 



Round Wood Silo Plastered With Cement. 



The silo described below, which is 20 feet in diameter and 

 34^ feet deep, having a capacity of 228 tons, was built at the 

 University of Illinois the summer of 1903. The first silos of 

 this kind built in the state, so far as known by the writer, were 

 three erected by Mr. H. B. Gurler, of DeKalb, in 1897. (This 

 is the style of construction frequently referred to as the Gurler 

 silo). These three silos have been filled every year, and have 

 given most excellent satisfaction. It seems probable that silos of 

 this constrtiction will not only preserve the silage perfectly, but 

 will prove to be lasting as well as economical for most sections 

 of the state. As few silos of this type have as yet been built in 

 Illinois, a detailed description of the one at the University is 

 given. 



The excavation and foundation were made by cutting a 

 circle 20 feet 10 inches in diameter and four feet deep, and laying 

 up a four-inch brick wall against the clay. (Cut 11). This wall 

 was slushed in full on the back side with mortar so that every 



