30 



PRACTICAL SILO CONSTRUCTION 



there is a difference of 20 cents a sheet between the 

 28-gauge and the 24-gauge. 



The following table shows the number of sheets 

 of steel required for the forms or centering for 

 various diameters of silos, with the approximate 

 circumference of the inside form or core, also the 

 number of wood-clamps demanded for the forms to 

 insure their being held rigidly in position. 



TABLE III 



STEEL SHEETS REQUIRED 



If no other means for bending the sheet steel to 

 the required curve are at hand it may be placed over 

 a round stick of at least 6" in diameter, and, by 

 fastening one end securely and exerting pressure 

 upon the opposite end of sheet, it can be bent to 

 conform to the desired curve. The above table 

 shows the number of the usual sized sheets to order 

 for both outside and inside, or core form. These are 

 bent to the desired curve and then cut so to have 

 the form meet exactly at the four quarters of the 

 circle. By thus making the centering in four quar- 



