UNIVERSAL PORTLAND CEMENT CO. 
49 
The wreckage scattered around the silo illustrated on page 48, after 
the cyclone, proves conclusively, without argument, as to whether or not 
concrete stands after severe wind storms. 
Properly reinforced concrete silos will not be injured by lightning; in 
fact, different concrete silos have been struck by lightning, and if it were 
not for the statements made by reliable eye witnesses, no one would be- 
lieve that the silos had been struck. A possible explanation of this is, that 
the lightning runs down the reinforcement into the ground and where a 
concrete roof and concrete chute are provided, there is no opportunity for 
lightning to enter the structure. 
All available data tend to show that the waste of silage in silos built 
of concrete is fully as small, if not smaller, than in silos of any other ma- 
terial. Of 50 silos in the states of Illinois, Michigan, Wisconsin, 
N^^Wasted Ohio, Kentucky and Missouri, on which reliable data 
Silage were obtained, 25 showed a loss of less than one-half ton of silage 
from all causes, 18 showed a loss between one-half ton and two 
tons, and 7 showed a loss of more than two tons. In terms of percentage 
of the total silage in each silo, it was found that thirty-four had an 
annual loss of less than one per cent, thirteen had a loss between one and 
three per cent, three had a loss greater than three per cent. The greatest 
loss in any case was about six per cent. 
These figures are somewhat lower than those recorded at some of the 
state agricultural colleges, probably for the reason that the college dairy- 
Twin Silos, 14 feet by 40 feet, built for W. Swart of Plymouth, Wisconsin, by W. H. Limberg, silo 
contractor and inventor of the Limberg Concrete Silo Molds. 
