OCTAGONAL, SILO. 



Yl 



nearly one-half of the height of the silo, and 2x8 in. the rest of 

 the way, fastened with 20 penny spikes. The girts should be 16 

 inches apart at the bottom for one-third of the height of the 

 silo. They may be 18 inches apart the second third of the dis- 

 tance, and above that the distance between them can be in- 

 creased till they are 2 feet of more at the very top. A double 

 row may be used for a plate. Sound timber only should be used. 

 Care should be taken to have the girts securely spiked at the 

 corners, so that the joints will not give. The horizontal girt 

 sections take the place of hoops in the round silo and must be 

 strong. Not less than six or eight spikes should be used at each 

 splice. One of the causes of failure in home-made silos of 

 every kind is that the ordinary carpenter, who has probably never 

 built a silo before, has but a limited idea of the pressure on the 

 sides of a silo 30 or more feet deep, and does not realize the 

 disappointment and loss occasioned by a poorly built silo. 



A simple method of getting the walls perpendicular is to 

 first lay the sill, which should be fastened to the wall securely. 



Fig. 25. — Perspective, showing construction of frame, and double 

 lining with paper between. The door is made of two thick- 

 nesses with paper between, as shown. 



