652 Report of the Fikst^Assistant of tiik 



circle. Studding long enough is made by lapping. The stud- 

 ding need not be larger than 2x4 inches, except for silos of very 

 large diameter. The studs are set a little nearer than 12 inches 

 from center to center, and are toe-nailed to the sill. Every alter- 

 nate stud is set first and stayed by a board to a temporary post in 

 the center of silo. These studs are made plumb and stayed by a 

 few strips of the outside sheeting tacked to each. The interme- 

 diate studs are then set in and nailed to the strips. The outside 

 sheeting and siding aire started at the bottom and carried up 

 together. The lining is then put on. The lining of the round 

 silo is made of fencing lumber split in two, making a little less 

 than half-inch lumber. The fencing should first be sized to be of 

 unvarying width. Three layers are put on the inside with good 

 quality tar paper between, as shown in Fig. 2. For the last layer 

 10 d. nails are used and 8 ds. for the first two. The sheeting 

 outside is of the same lumber except for very large silos. The 

 ordinary siding for small silos is rabbeted on the thick edge. The 

 doors are usually cut in after the lining is on, except one at the 

 bottom. These are about two feet wide by three or four feet 

 high. The studs at each side of where the door openings are to 

 come are made double. Different kinds of doors, boarded both 

 sides of cleats made of scantling, are recommended to swing on 

 hinges. It would perhaps be better to have an outer door to 

 swing on hinges, and have a double set of short one-inch boards 

 cut to fit, in length equal to the width of the opening, held in 

 place by cleats nailed on the studs. The inner surface of the 

 boards may be flush with the inner lining of the silo and a layer 

 of tarred paper should be betw^een the boards. Where the filling 

 is done through the one door at the top of the silo it is made 

 about 3 feet wide and high enough to readily admit a man at the 

 side of the carrier. The location of such a door is shown in 

 Figure 4. 



EOOF. 



The roof can be made in any convenient style but is usually 

 eonical or two-sided, as shown in the illustration. A conical roof 

 on one of the smaller sized silos can be made without rafters, a 



