116 Concrete Silos 



is necessary at all times to keep water upon tlie scaffold, 

 since many times the work will dry too rapidly and it 

 will become necessary to sprinkle the wall before the 

 next coat of plaster is applied. 



Before applying the last layer of plaster to the in- 

 side, the inner part of the door form should be removed. 

 With this form- out of the way, the finish coat, consist- 

 ing of equal parts of cement and screened sand, may be 

 smoothly applied in such a manner as to leave the in- 

 side surface flush with the face of the door post. The 

 use of water is very important during the application 

 of this coat. A force pump, preferably a pump run by 

 a gasoline engine and a line of hose, is a great con- 

 venience in keeping the walls thoroughly wet. 



The finish coat should be smoothed up neatly. When 

 it has sufficiently set, one of the plasterers should mix 

 up a wash of pure cement and give it what is commonly 

 called a "slush coat." It should be the aim of the 

 plasterer to finish this coat and have it set without the 

 appearance of checks of any kind. This coat should 

 extend down upon the foundation wall to the bottom 

 of the silo. 



Under ordinary conditions, by the time the inside 

 is finished, the wall, which is now 2 inches thick, has 

 set sufficiently to permit the removal the outside stud- 

 ding and parts of the door form still in place. The 

 inside scaffold should be removed also; one should 

 begin at the top and pass the material out through the 

 door opening. The first step in taking down the tem- 

 porary studding is to remove all the hooping material. 

 When the foot is forced loose, the 2x4 may be pulled 

 out straight from the silo until it is free except for the 

 nail at the top. By pulling down on the stick, one may 

 detach it from this nail and lay it on the ground. It 



