17 



TPPER HALF. 



When the sheeting and lath have been put on to within about a yard of 

 the top of the first length of studding, a platform may be laid to enable the 

 workmen to erect the second half in the same manner as the first was put up. 

 It is well to leave the centre piece resting on the concrete floor, and extend it 

 by adding another piece. The second half of the studding should be spiked 

 to the first with a lap of about 2 feet. After plumbing and tying in place, the 

 sheeting and lath are put on, and finally after removing the platform the 

 middle is completed. Care must be taken that no wide cracks are left. 



PLASTERING. 



The wall of the silo is plastered to a depth of about 1 inch, with a rich, 

 well-mixed mortar or concrete made from three parts of sharp, clean, coarse 

 sand, or finely crushed stone, and one part of good cement. The mortar should 

 be about as thick as that used in plastering a house. By giving the cement 

 lining a wash of cement once in two years, the lining is protected against wear 

 and corrosion. 



DOORS. 



When the studding is being spliced for the erection of the upper half of 

 the silo, care must be taken that the studding between which the doors are 

 to come are not lapped, but are put end to end and tied together with a 6-foot 

 piece of 2- by 4-inch spiked to each at the juncture. This allows a door-jamb, 

 which is simply another 2- by 4-inch set back from the inside edge of the 

 stud 1% inches and either well spiked or bolted into place. The upper and 

 lower jambs of the door are made from short lengths of 2- by 4-inch spiked 

 across at the proper places. The doors may be made from flooring-boards 

 nailed together at right angles, with a sheet or two of tar-paper between. 



SIDING. 



Put hoops on the silo and nail lumber to them. The hoops are made of 

 three thicknesses of the sheeting lumber put around the silo every 4 feet. 

 Put on one thickness at a time, breaking joints to ensure strength, and be 

 careful not to cross doors. Nail the lumber vertically and cover the cracks 

 with strips. 



ROOF. 



The roof most easy of construction is that given for a concrete silo, but 

 a plate similar to the lower sill on this must be put around on the top of 

 the studding. Provide for a circulation of air through the wall to prevent 

 decay of the woodwork. 



BRACING. 



Anchor the silo firmly with four strong guy-wires, not too long. 

 THE STAVE SILO. 

 THE STAVES. 



Hemlock and spruce are very suitable for staves. They may be of 

 2- by 4-inch or 2- by 6-inch scantling, or they may be from 1% to 3 inches 

 thick, and from 5 to 9 inches wide; but 2- by 6-inch material, with at 

 least one side and the edges dressed, is preferable, especially for the larger 

 silos. A slight bevel may be given the edges with advantage, except in the 



