II Oct., 1909. 



Silos and Sila^'C 



663 



The Foundation. — Roughly level site for a diameter of 16 feet, 

 making provision if on slope for drains to carry off anv flow of water. 

 Prepare eight foundation posts of 6-in. x 4-in. red-gum according to the 

 accompanying drawing, having 6-ft. post, 3ft. sole, and 4-ft. strut. 

 Halve the post and sole together edgeways and secure with 6|-in. x |-in. 

 bolt. Halve the strut edgeways on to the post and sole and secure with 

 9j-in. X o-in. holts. Round timber roughlv dressed may be substituted 

 for the red-gum, but care must be taken to have the inner face dressed 

 truly. In this case it is probable that longer bolts will be required. Fix 

 a peg in the centre of the site selected for silo, and describe a circle with 

 a trammel 7 ft. 8 in. in length. Sink posts 2 ft. 9 in. in the ground 

 so that the inside fare of each post is true to the end of the trammel. 

 Keep tops of posts to one level and faces trulv perpendicular. Well ram 

 the earth put back. From the centre line of face of post to the same line 

 in the next post is 5 ft.io-| in. measured straight. Put posts in to suit 

 line of roof ridge, which should suit position of chaff or silage cutter and 

 elevator. The elevator should go in at top of silo in line with the ridge. 



The Treble Hooi'.s. — Nail 

 three of the 6-in. x g-iu. boards 

 to the inside of the posts, care- 

 fully springing the first of them 

 to the circle of the tranmiel, off 

 which halfan-inch, the thickness 

 of the board, must first be cut. 

 Make butt joints and let each 

 successive hoop break joints. 

 Keep the bottom edge of tlic 

 first treble hoop 3-I-.7 inches 

 from the top of the post, which 

 will leave it 4^ inches above 

 the surface of the gi'ound. A 

 similar treble hoop is fixed so 

 that its upper edge is i^ inches 

 below the top of the post. In 

 fixing the upper treble hoop, 

 the trammel, to which a length 

 eninji" piece has been nailed, 

 should be used on the slant to 

 insure a correct circle. These 

 two treble hoops are used to 

 fix studs in upright position 



The Studs and Single Hoops. — First bore and check studs as 

 in drawing. The 32 studs (6/24-ft. and 26/21-ft. — 4-in. x 2-in. 

 hardwood) are to be bored for bolts and countersunk \ inch deep, i inch 

 diameter clear, for heads of bolts. The centre of first hole is to be 5 inches 

 from the f)Ottom, the second i8| inches, the third 32 inches, the fourth 

 53 inches and thence at intervals of 35 inches, the ninth and last being 

 at 19 feet. The first and third holes are to be bored for |-in. bolts, and 

 all others for |-in. All studs are to be checked out 6 inches wide and 

 \ inch deep on the same side as the countersinking ; from bottom of stud 

 to bottom of first check 32 1 inches; and from bottom of first to bottom of 

 second 35 inches, and so on to the sixth check 17 ft. 3^ in. from the 

 bottom. The seventh and last check is 20 feet exactly from the bottom of 

 the stud. 



TYPICAL IOO-TON SILO. 



ihown 



