12 



support the forms. The sections when in place are bolted together as provided 

 for during their construction. This holds them rigid. The first section of 

 the wall will be built with the forms resting on the foundation, the inner one 

 being barely on the inner edge of the foundation, so that the inside wall of 

 the silo will be perpendicular from the bottom up. To keep the walls so 



(Fig. 5.) Showing method of erecting staging. 



throughout after the first section has been laid, allow the forms to lap back 

 on the solid concrete at least G inches at each raising. For raising the forms 

 and hoisting the concrete, block and tackle is necessary. When the forms are 

 removed each time, smooth down both surfaces with a board, and when the 

 silo is completed, go over the inner surface with a thin coat made of one part 

 cement to one part sand, applying it with a whitewash brush. Keep the 

 inner surface wet for a week, and a smooth and lasting surface will 

 result. 



