304 



SOILING CROPS AND THE SILO. 



but they also cut into the staves, which is somewhat 

 objectionable. 



Flat hoops are usually made of band iron one- 

 eighth of an inch thick and varying in width from, 

 say, two and one-half to three and one-half inches 

 with the size of the silo. These two are held in place 

 by lugs which differ in some respects from those used 

 to hold the round hoops in place, but the principle 

 involved is the same. For a silo sixteen feet in 

 diameter, each complete hoop which encircles the 



Fig. 32. Lugs for Hoops 



a, Cast-iron lugs for round hoops. 



b, Wedge lug for fiat hoops. 



same should consist of two separate pieces, and for 



one with a much greater diameter, of three such 



pieces. There is then less of a strain on the thrends 



while the burrs are being tiglntened. The lugs of 



the various hoops should also be distributed ratlier 



than rise one above another in a straight line. 



^^^oven wire hoops are sometimes used when 



the silos are small. These vary in width with the 



requirements of the silo. The power which some 



kinds of woven wire have to contract and expand 

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