620 Journal of Agriculture. [8 Oct., 1907. 



treble hoops with two 3 inch nails at each. These will hold stud until 

 ready to bore for bolts. It is well to try every fourth stud with a sheet 

 of iron to see that lap comes correctly. ' Following these directions, the 

 whole 32 studs are erected, the last, however, being put up 22 inches 

 distant from the first instead of 13^ inches; this is to leave space for 

 the port holes. The distance between the last stud and the last but one 

 will be less than 13I inches. For the purposes of the roof, put two 

 24 feet studs opposite one another and attached to foundation posts. 

 Place the 4 other 24 feet studs at the third stud position each side of these 



two. 



The next operation is the putting on of the single hoops. These are 

 alternatelv on the inside and outside of the studs, the inside hoops taking 

 the horizontal lap of the sheets of iron forming the lining and falling 

 into the checks made as already described. At the top of the silo the 

 last hoop is kept on the outside, there being no horizontal joint to make 

 Light. First put on a single hoop between the two treble hoops. Next 

 put on the others carefully adhering to the' following directions. :Mark 

 the hoops for positions of studs before putting up, by bending them 

 round on top of the upper treble hoop and against the outer faces of the 

 studs. The hoops should be fixed to the same studs as marked. This 

 need not be done for each hoop, every fourth one will be sufficient. 

 Unless this is done carefully, the silo will most likely have different 

 diameters at different points and trouble will ensue when putting on the 

 lining. The outside hoops should lap over so as to cross two adjacent 

 studs. They are secured at each stud with 2| by | inch bolts and at 

 laps with 3' by | inch at first stud of the lap and 3J by g inch at the 

 last one, there being a plate washer 5 inches by i^ inches by fV inch 

 with I inch hole in centre at the end bolt. The inside hoops are scarfed 

 3 inches for a length of 3 feet 2J inches to cover three studs and butted, 

 see sketch, and they are fastened to the studs with 2 inch nails. Care 

 should be taken not to have the joints vertically above one another. 



Short pieces of 4 by 2 inch hardwood are put in between the portholes 

 and between the porthole studs alongside row of portholes. Nail short 

 pieces of 3 by i inch for the width of two studs opposite to the inner 

 hoops ; these will serve as a ladder for access to the top and the portholes. 



The Lining. — Six feet by three feet 24 gauge galvanized flat iron is 

 used, tarred on one side as already directed. The tarred side is kept 

 on the outside against the studs. If the studs and hoops have been 

 erected as described, the sheets will have a lap of 3 inches vertically on 

 the studs and one inch horizontally on the hoops. Carefully press the 

 sheets out to the line of the circle before nailing, and start at the centre 

 stud working out to the side stud. This will make the iron set better. 

 Nail with i^ inch clout nails on the studs, 3 inches apart at the laps 

 and 6 inches on the other studs. Nail with f inch clouts to hoops at 

 horizontal laps, putting clouts \ inch up and down alternately to avoid 

 splitting hoop. The upper sheet in each lap is put outside the lower to 

 keep the weather out and prevent rain working in. 



The Roof. — Bolt two purlins, 20 feet long, to the centre 24 feet roof 

 studs at the top, letting purlins project in order to attach block and 

 tackle, if required. Centre purlins are bolted to the third studs each 

 side of ridge studs, which are 24 feet high as directed and bottom purlins 

 are bolted to ordinary length studsi — the sixth from the ridce studs. 

 The centre purlins are fixed to suit the pitch given by the ridge studs. 



