150 DESCRIPTION OF FEEDING STUFFS 
third, modern round silos. Silos of the first kind are still met with 
in beet-growing districts, where the wet pulp from the beet-sugar 
factories is cured or siloed in trenches near the factories, or in 
shallow silos built up with board walls. Silos of the second type 
are no more built or used, so far as is known. 
The first silo of the third type was built at Wisconsin Experi- 
ment Station, in 1891, by the late Professor F. H. King, who 
strongly urged the building of these silos in preference to other 
silo types. This original round silo had a diameter of 16 feet and 
was 27 feet high (capacity, about 90 tons of green corn). Since 
the construction of this silo the tall, round silo has become well- 
nigh universal in this country. While the materials used and the 
dimensions have varied considerably, the principle of construction 
of practically all silos built since the early part of the century has 
been that first worked out and described by Professor King. Mod- 
ern silos are built a great deal taller than was previously the case, 
the silos built during the last decade or two being 30 to 40 feet high 
or more, with a diameter varying from 12 to 24 feet, according to 
the capacity wanted. It is not reeommended to build silos of larger 
diameter than 20 feet, as it is difficult to feed out the silage from 
such silos rapidly enough to prevent considerable loss through 
decay of the surface layer, except in cases of very large herds. The 
following table shows the relation between the size and capacity 
of different silos of a diameter from 10 to 26 feet and a height of 
20 to 40 feet: 
Approximate Capacity of Cylindrical Silos for Well-matured Corn Silage, 
in Tons (King) 
Depth Inside diameter of silo, feet 
of silo, : 
feet 
10 12 14 15 16 18 20 21 22 23 24 25 | 26 
20 | 26} 38] 51) 59) 67] 85] 105) 115) 127) 188) 151) 163 | 177 
21 28 | 40] 55] 63) 72) 91) 112] 123) 135) 148) 161) 175 | 189 
22 | 30} 43) 59] 67] 77] 97) 120} 132| 145 | 158) 172 | 187 | 202 
23 | 32 | 46; 62} 72) 82)| 103] 128) 141 | 154 | 169; 184) 199; 216 
24 | 34 | 49) 66) 76| 87] 110) 135 | 149 | 164| 179 | 195 | 212 | 229 
25 | 36 | 52} 70] 81] 90| 116 | 143) 158 | 173 | 190 | 206 | 224 | 242 
26 | 388] 55] 74) 85] 97} 123] 152 | 168 | 184 | 201 | 219 | 237 | 257 
27 | 40] 58) 78| 90/103} 130] 160 | 177 | 194 | 212 | 231 | 251 | 271 
28 42 | 61) 83] 95) 108] 187 | 169 | 186 | 204 | 223 | 243 | 264 | 285 
29 | 45 | 64) 88/100) 114) 144 | 178) 196 | 215 | 235 | 255 | 278 | 300 
30 | 47 | 68] 93/105 | 119 | 151 | 187 | 206 | 226 | 247 | 269 | 292 | 315 
31 49 | 70} 96] 110! 125 | 158] 195 | 215 | 236 | 258 | 282 | 305 | 330 
32 | 51 | 73, 101 | 115 | 131 | 166 | 205 | 226 | 248 | 271 | 295 | 320 | 346 
36 | 64 | 105} 130 | 139 | 155 | 190 | 235]... ] 66. | ee] ee eee foe 
40 | 75 | 121) 150) 165 | 180 | 228 | 279 
1 Wisconsin Bulletin 28; Report 10, p. 201. 
