34 PRACTICAL SILO CONSTRUCTION 



no assurance that the form will not be raised higher 

 upon one side than upon the opposite side of silo, 

 thus throwing the wall from the vertical line or 

 plumb. With every silo form heretofore explained, 

 this feature has never been given attention; and its 

 importance is apparent to any one at a glance, as it 

 insures a perfect wall without the bother of leveling 

 the form each time after raising. The clamps at 

 sides are shown by d d; and, as the same designating 

 letters are given to each part in Fig. 5 as in Fig. 4, 

 it is an easy matter to understand the invaluable 

 and important features of this simple and easily 

 constructed silo form. 



The tackle used to raise the forms is shown by 

 the dotted lines in Fig. 5. The wire cable, or ropes, 

 pass down upon one side of the posts, in center, to a 

 drum or roller at the bottom of same. This drum is 

 fitted with a ratchet-wheel and pawl, to lock the 

 drum at any point desired, also with two arms, or 

 cranks, for moving the drum. Hence, with two men, 

 the form is very easily raised each time in a far 

 more simple and desirable manner than by wire 

 loops over levers, which do not raise the forms 

 evenly, and consequently require greater effort, with 

 danger of breaking out pieces of the concrete wall. 



The vertical posts in center of Fig. 5 are braced 

 at the bottom by horizontal pieces bolted to same. 

 This is made so as to have ample bearing surface 

 upon the ground, so the weight of forms will not cause 

 it to sink or bury into the earth at one side, and thus 



