Concrete Silos 



93 



felt packing. They are set into the forms as the 

 concrete is poured. 



Van Guilder System. This system, which is con- 

 trolled by the Van Guilder Hollow Wall Company, 



Van Guilder Hollow Wall Form 



Rochester, N. Y., makes a silo with either a single or 

 a double wall. Either type is made with a small 

 machine, as shown in the illustration, which is set on 

 the footings tamped full of concrete, then removed and 

 carried around to a new position, the operation con- 



