SILOS. 191 



681. What is the distance around a rectangular silo, 20 

 feet wide and 80 feet long, that also contains an area of 

 1,600 square feet? 



682. Since the round silo incloses the greatest space 

 in proportion to the length of the wall inclosing it, what 

 is the percentage of saving in lumber for a silo having a 

 surface area of 1,600 square feet when the round form 

 is adopted rather than the rectangular? 



683. What is the percentage of saving when the round 

 form is adopted rather than the square ? 



684. A farmer has built a silo 30 feet .square and 

 30 feet high. How many feet (B. M.) of lumber 

 were required for the walls, plank lumber 3 inches thick 

 being used ? 



685. His neighbor at the same time built a round silo 

 having the same height and an equal capacity. He also 

 used plank lumber 3 inches thick. How many feet (B. 

 M.) were required for the wall? 



686. Lumber was purchased at $22 per M (B. M.) ; 

 what was the cost of that used in the wall of the square 

 silo? Round silo? What was the difference in cost? 



Proper diameter of silo. Silage of all kinds readily 

 spoils unless it be fed regularly, evenly, and at a suffi- 

 cient rate. Experience has taught that a feeding surface 

 of at least 2 inches depth should be removed daily. Where 

 5 or 6 inches are daily fed, there is but little waste of food 

 materials. It is necessary so to build the silo that its 

 diameter may be in keeping with the number of cattle 

 to be fed. If made too large less than 2 inches will be 

 fed daily, hence there will be waste and loss. Experi- 

 ments show that to secure most satisfactory results, a 

 horizontal feeding surface of 5 square feet per cow should 

 {>e provided. 



