lo July, 1911-] Silo Coustriiciiou. 499 



Bolts, nuts, and washers, 8 55-in. x f-in., other purlins and studs. 



Bo.ts, nuts, and washers, 8 4-in. x |-in., port holes. 



Bolts, nuts, and wathers, 80 3^-in. x |-in., treble hoops and studs; lapped 



hoojis, plate washer, and stud. 

 Bolts, nuts, and washers, 36 3-in. x f-in., lapped hoops 

 Bolts, nuts, and washers, 200 25-in. x f-in., outer hoojjs r.nd studs. 

 Bolts, nuts, and washeis, 16 8-in. x 5-in., treble hoof)S and foundation posts. 

 Wire nails, 2 lbs. 4-in., 4 lbs. 3-in., 14 lbs. 2-in. 



Plate washers, 24 5-in. x i-in. 5-i6ths-in., with 7-16-in. hole in centre. 

 Cement, i bajj. 



Material required for 30-lt. Elevator. 



^\hite deal, 6-in. x i-in. ; iq 20-ft., sides, flcKirs, anfl ledges. 

 White deal, 6-in. x ^-in. ; 4 15-ft , cover. 

 Oregon, 6-in. .\ i^-in. ; i 8-ft., bearers. 



Chain, 6o-feet, i 9-i6ths-in. pitch, with coujjler and j)in. (No. 45 link.) 

 30 Oregon slats, with attachments for No. 4^^ link. 



I 8-in. diameter sprocket wheel, 16 teeth, with 32-in. H])lni'.les, ig-in. diameter, 

 for No. 45 link. 



1 pulley 8-in. diameter x ii|-in. flat face, with 20-in. sjiindle ig-in. in diameter. 



2 deadeye bearings. 



2 adjustable bearings. 



I 22-teeth, 105-in. diameter, sprocket vvheel for No. 52 link. 



1 lo-teeth, 5-in. diameter, sprocket wheel for No. 52 link. 

 14-ft. chain, i^-in. pitch, with coupler and pin (No. 52 link). 

 8 25-in. X ^-in. bolts, nuts, and washers. 



8 iron f-in. bolt washers. 



2 sheets of 72-in. x 36-in. 24-gauge iroii. 



The cost may be computed from above list. At present prices of material 

 in Melbourne, it would run into x^3i los., of which ^8 is for the 

 elevator. With an experienced builder, assisted by three handy men, the 

 whole work of erection, including construction of elevator, should be com- 

 pleted within four or five days. After the silo has been erected some time, 

 and the greenness of the wood considerably lessened, the whole of the 

 woodwork, and. in any case, the lower 3 feet, including both treble hoops, 

 should be painted. 



The hoops close to the ground must not Ije covered with earth ; they 

 are an essential portion of the structure, and should not be weakened by 

 rot or white ants. The floor may be the earth levelled off, or a con- 

 crete floor may be put in. 



A ring of concrete about 12 in. wide at bottom and 6 in. at top, 

 and high enough to meet bottom of iron and studs, will makt; a good 

 finish and provide a support for bottoms of studs. 



Directions for Building a ioj-ton Silo. 



A 102-ton silo is similar in most rt-spects to a 69-ton, having the 

 same diameter, but l>eing 30 f et t high. The foundation posts are 9-ft. 

 instead of 6-ft., and should be sunk 3 ft. in the ground. In all other 

 respects they are similar to the posts for a 69-ton silo. There are thirty- 

 two 2i-ft. studs, six 14-ft. and twenty-six ii-ft. The boring on the 

 2r-ft. studs is the .same as for a 69-ton silo, except for the addition 

 a i^-in. diameter hole 5 ft. 10.^ in. from the lK)ttom of tlie stud for the 

 third treble h(M)p. The checks are similar in all respects up to the sixth, 

 except that the bottoni of the seventh and last check on the 21 -ft. studs 

 is 20 ft. 2\ in. from the ijottom of the stud. The 14-ft. and ii-ft. 

 studs are halved for 2 ft. of the length from the bottom, ami §-in. 

 diameter holes are bored and countersunk at ' ft. 11 in., 5 tt. 10 in., and 

 & ft. 9 in. Irom \\\r bottom, and checked similarly to 21 -ft. .studs at 

 I ft. 2\ in.. 4 ft. \\ in., and 7 ft. o.\ in. from bottom of studs to l>ottom 



