130 



Concrete Silos 



goes up, so that the structure is held perfectly rigid 

 at every stage of construction. Alternate hoops en- 

 tirely encircle the silo, when the intermediate hoops 

 fasten to door spreaders, these passing around the 



The Playford Cement Stave 



door openings and leaving them unobstructed. A 

 combination sectional ladder and chute is also pro- 

 vided. After erection the silo is treated with a special 

 waterproof filler coating on the inside. 



Reinforced Stave Silo. This stave, which is con- 

 trolled by the Playford Manufacturing Company of 



FOR Poirmwa 



Reinforced Stave Silo 



Elgin, Illinois, carries an outside vertical rib on one 

 edge through which passes a a /4-inch twisted reinforc- 

 ing bar. The thickness through the stave proper is 



