106 



Concrete Silos 



i -E 



corners of these two boxes, care being taken that the 



bevel is laid in the right direction. The rods, which 



should be of %- 



inch iron and 32 



inches long, 



with a 2-inch 



right angle 



turned at each 



end, can now be 



placed in the 



holes, and the 



narrow strip 



which was 



ripped off can 



be cleated back 



into place. A 



cleat should be 



used at each rod 



and should be 



carefully nailed 



with 4-penny 



nails. The 2x4 's 



(H in the plate), 



which have 



been spliced together to a length of exactly 30 feet, 



may now be placed in the form, to which they may be 



fastened by means of boards across the front. These 



2x4 's should be gauged out 7 inches from board A. 



The door form is now ready to be raised into place. 

 When it has been raised to a vertical position, it should 

 be lifted up high enough so that the 8-inch board can 

 be let down on the inside of the metal lath already in 

 place. The 2x4's should rest squarely on the founda- 



ELEVATION 



r 



// tf 



L 



DETAIL OF "A" 



SECTION 



Detail of Door Frame. 



