Concrete Silos 103 



should be stood on edge on this base and concrete 

 should be poured on both sides of it. Its position 

 should be on a circle having a radius 2 inches greater 

 than the inside radius of the finished silo. The strips 

 of lath should be lapped about 3 inches at the ends. 

 When the circle is completed, the wall outside of the 

 lath should be carefully leveled. In eight or ten hours 

 the dirt inside of the foundation wall may be thrown 

 out to within 10 or 12 inches of the bottom of the 

 concrete. 



In building this type of silo it is necessary to erect 

 on the inside a scaffold of at least four platforms be- 

 fore any other work can be done. It is very important 

 that this scaffold be so constructed that the plank run- 

 ways of the four platforms shall be at a uniform dis- 

 tance from the wall of the silo. In silos 14 feet or 

 greater in diameter, a six-legged scaffold is used. For 

 a 12-foot silo a scaffold of only four legs is needed. In 

 order to place this scaffold properly there should be 

 marked on the floor of the excavation a circle having a 

 radius 2 feet less than the radius of the silo. The six 

 legs of the scaffold, granted that a six-legged one is to 

 be used, should stand on this circle and should be equi- 

 distant from each other. The distance will be equal 

 to the radius of the circle upon which they stand; the 

 sweep used in marking this circle may therefore be 

 used as a measure, marking the place for each leg to 

 stand on the circle until the six points are located. It 

 will be much more convenient to have the door open- 

 ing of the silo come between two legs of the scaffold 

 than directly opposite one. 



All the crosspieces should be of 2x4 material and of 

 such length as to extend at least a foot outside the 



