OCTAGONAL SILO. 71 



by means of bolts set in the wall, and then erect at each corner 

 and on the inside a temporary post or scantling to serve as a 

 guide, braced in position so that it is perpendicular both ways, 

 and the girts then laid and spiked in position, one above the 

 other. 



The lining is, of course, put on up and down and should be 

 matched and of good thickness, say 1*4 or 1% if but one layer 

 is used. If two layers, it need not be so thick, %-inch flooring, 

 and the outer layer not necessarily matched. The corners should 

 be fitted as nicely as possible, and it is a good plan to block out 

 the corners, as shown at Fig. 26, a, a, a, so that the tongues and 

 grooves can be properly adjusted to each other. 



John Gould, a prominent dairy writer and lecturer, recom- 

 mends, where one thickness of matched lumber is used in the 

 above manner, that the lining be thoroughly coated on the out- 

 side with heavy application of coal tar, or other similar sub- 

 stance, so as to prevent the air penetrating the pores of the 

 lumber, and causing the silage to dry onto the inner surface. 



Any style of door can be used, but an effective continuous 

 door is shown in the illustration. If any of the girts be cut 



Fig. 26. Showing method of laying sill and bolting same to foun- 

 dation for an octagonal silo. 



