Concrete Silos 105 



arcs. With the other nail mark the curve on the 1x6- 

 inch board. With a straight-edge, extend the radius 

 across the board, locating the lines at ends of board for 

 sawing off, as shown by dotted lines in the plate. This 

 pattern should be carefully sawed out and used in 

 marking out the rest of the segments necessary. These 

 plate pieces are to be doubled and the joints broken as 

 the plate is built up. 



In order to cast the posts or door jambs for the con- 

 tinuous door opening used in this type of silo and to 

 properly hold the reinforcing in place, a form must be 

 constructed extending the full height of the silo above 

 the foundation. One of the plates gives the details of 

 construction of this form. The 6-inch boards should be 

 scribed the full length, 1% inches from the outside 

 edge. Beginning at the bottom, the points for the rods 

 should be located 26 inches apart on this line. Holes 

 should be bored at each one of these points with a bit 

 1/16-inch larger than the size of the rods to be used. 

 These 6-inch boards are then ripped apart upon this 

 line. 



The next step is to nail together the 8-inch board 

 C and the wider part of the 6-inch board A. Five or 

 six pieces of 6-inch board (E in the plate), should now 

 be sawed and nailed to the underside of the 8-inch 

 boards, care being taken that the two sides of the 

 form are squared with each other before these boards 

 are nailed into place. To insure a uniform distance 

 between the posts when the form is completed a gauge 

 18 inches long should be prepared and used between 

 the two halves of the form during this nailing. The 

 2x2 's, which have been dressed out and sawed the 

 proper length, may now be securely nailed in the 



