26 PRACTICAL SILO CONSTRUCTION 



As the weight of raising the forms is largely upon 

 these pieces, they should be at least 2x6" and of 

 selected wood, so that they will not bend or break 

 from the strain. 



A number of the clamps are constructed so 

 that they will hold the sheet steel to the true 

 circle. This requires less where the 24-gauge steel 

 is employed than where lighter weight sheets are 

 used. 



The arrangement of the clamps and braces are 

 shown in the plan of one-half of silo form, at Fig. 4, 

 in which a a refers to the central vertical upright 

 used to raise the silo form, as required; b b is the 

 2x6" strip extending across the top of the silo form,' 

 by which it is raised; c c are the guide-strips em- 

 ployed to keep the silo form level when it is raised, 

 and also when the weight of concrete is all upon one 

 side of form; d d illustrates the position of the wood 

 clamps or vertical strips attached to the horizontal 

 2x6" strip, as explained for Fig. 3. The clamps 

 designated by this letter at the quarter segment of 

 silo form are connected to the main horizontal strip 

 by two brace rods, //, which may be made of 2x4" 

 lumber, bolted to the clamp and also to the sliding 

 guides c c at center. The clamps e e, shown be- 

 tween the quarter segments of circle are simply 

 employed to keep the sheet steel to the true circle. 

 These need not be as strong construction as the 

 clamps placed at each quarter of the circle, and are 

 held from spreading or warping from position by 



