11 



the circle to a depth of 4% feet, keeping the wall sloping slightly outwards 

 and leaving the bottom level. Then mark off another circle the exact size of 

 the inner diameter, using the same centre. Drive stakes with their outer edge 



(Pig. 3.) Foundation. 



on this circle around it, about 2 feet apart, and brace them from the middle. 

 Then bend thin boards around the outside of these stakes. This constitutes 

 the inner form for the foundation, the earth wall being the outer. Before 

 completing this, cut under the bank all around to give footing to the founda- 

 tion, as shown in figure. A tile drain around the outside of the footing would 

 remove any water that might accumulate. When the foundation-walls are 

 completed, the bottom must be laid. Put down a solid layer of gravel 6 inches 

 thick, and upon this put from 4 to 6 inches of concrete. 



WALL. 



The forms are first to be set in place, ready to receive concrete. The 

 thickness of wall should not be less than 6 inches, and the forms described 

 are suited to this. It is impossible to give very definite directions for the 

 erection of staging when elevating the forms. The accompanying illustration 

 may be of use, but it sometimes will be wise to obtain the assistance of a 

 mechanic when commencing. Scaffolding is necessary both inside and out to 



(Fig. 4.) Forms detached from first course above foundation. 



