Concrete Silos 109 



Since the door form is carefully plumbed before 

 one begins to raise the 2x4 's, little difficulty is experi- 

 enced, as a rule, in having the whole structure stand 

 perpendicular when the circle is complete. In order 

 to have the segments of the plate unite properly, it 

 will probably be necessary to loosen the braces, which 

 were nailed on top before the circle was complete. 

 After the parts of the plate have been brought to- 

 gether the braces should again be nailed in place, so 

 that the scaffold and the studding may be securely 

 tied together. A second hoop should be placed around 

 the silo about halfway down from the top; and if the 

 2x4 's are very crooked and badly out of line, it may 

 be necessary to place still another hoop. 



The pieces of gas-pipe, which have previously been 

 cut to the right length, should now be placed in each 

 door box and wired to the ends of the rods across the 

 door form. 



The 24-gauge expanded metal or metal lath is used 

 in the construction of this silo. It comes in bundles, 

 each bundle usually containing nine strips, 8 feet long 

 and 18 inches wide. A bundle of this size contains 12 

 square yards and weighs 40^ pounds. This metal lath 

 is tacked to the inside of the studding with double- 

 pointed tacks. The work of placing it should begin at 

 the top, starting at the door post. The end of the 

 first strip should be passed through the opening in the 

 side of the door box and bent around the gas-pipe 

 already in place. Each strip of lath should be tacked first 

 in the middle ; the workman should go from that place 

 toward the end, and should, as the tacks are driven, 

 push out the lath so that it naturally takes the form of 



