ERECTION OF STAVE SILOS 59 



without the use of the extra section. Put on each successive 

 hoop up to as high as can be reached from ladders resting on 

 the ground, being sure to mark the spacing of the hoops 

 carefully. 



If a scaffold is used it is a comparatively simple matter to 

 stand on the scaffold and put on the successive hoops, tight- 

 ening them enough to hold the silo firmly in place. 



If a scaffold is not used, the steel may be put on in the 

 following manner: Drive two spikes into the silo in such a 

 manner that the hoops, which should first be properly bent 

 to fit the silo, may rest upon these nails. The nails should be 

 placed about J4 the length of the hoop from each end of it. 

 Then place a ladder convenient to each nail and let a man on 

 each ladder carry one end of the hoop section and place it on 

 the nails. The entire hoop is put in place in this way, and 

 then each man may go to a joint and put on the lugs and bars. 

 In this way the lower half of the steel can be placed upon a 

 30- or 32-foot silo. It is then a simple matter to hook the 

 ladders to the top of the silo and finish putting on the steel. 

 The permanent guy wires should be placed and the silo 

 plumbed before thoroughly tightening the hoops or putting 

 on the roof. It must of course be borne in mind that the 

 lugs must not all be placed on one stave; they must be 

 "staggered" around the silo. 



