ESTIMATE OF MATERIALS. 115 



silos being a little dearer, and larger ones a little cheaper 

 than this average figure. 



Estimating Material and Cost of Silos. 



Several writers on silo construction have published 

 bills of materials used in the construction of silos of 

 moderate sizes of the following three types: Wisconsin 

 Improved Silo, Modified Wisconsin Silo, and Stave Silo. 

 Farmers contemplating building a silo, can use these 

 estimates for figuring out the approximate cost of silos 

 of the three kinds under his conditions as to cost of 

 materials and labor. The estimates are made for silos 

 built in the open, on level land. On hillsides deeper walls 

 may be made to advantage, and where the silo is located 

 within a building no roof will be needed. Consequently 

 various factors may alter the applications of these esti- 

 mates, which are only offered as suggestive, with the 

 hope they may prove helpful. The first three estimates 

 of materials are published by Prof. Plumb, while the 

 others have been furnished by Professors King and 

 Withycombe. 



Estimate of Materials for Wisconsin 

 Improved Silos. 



Size, 30 feet deep, 14 feet diameter. Capacity 90 tons. 



Brick 3375 for foundation, 1 foot thick, 3 feet deep. 



Studs 50 pieces 2x4, 16 feet long. 



Studs 50 pieces 2x4, 14 feet long. 



Flooring for doors 32 feet, 4 matched. 



Sheeting 3000 feet, % inch, resawed from 2x6 16 foot 

 plank sawed 3 times, dressed one side to uniform thick- 

 ness for inside lining of two layers. 



Lining 1500 feet of same for outside. 



Tar building paper 200 yards, water and acid-proof. 



Nails 200 Ibs. 8-penny; 200 Ibs. 10-penny. 



Spikes 20 Ibs. 



Rafters 22, 2x4, 10 feet long, for usual ridge roof. 



