SUPPLEMENTARY CONCRETE PROJECTS 



167 



7) Center and bore hole in cross-frame as has been done 

 with platform. Nail blocks on ends of cross pieces to 

 hold in place when assembled. 



8) Place tile on platform and center axle in place with 

 cross-frame. Nail blocks on platform to hold tile in 

 place. pipe 



FIG. 157. Details of forms for garden roller. 



9) Axle should extend out of the tile at least two inches. 



10) Mix concrete 1 : 2-1/2 : 4 proportion to a quaky con- 

 sistency. 



11) Place concrete in tile around axle. Leave in place 

 for a week or more before using. 



12) For handle, assemble pipe and fittings, as illustrated in 

 plumbing project. This makes a very good elemen- 

 tary pipe-fitting exercise. See Sec. 334. 



147. A Hog Trough (Fig. 158). 



Requirements: To construct form, mix and place concrete, 

 and properly reinforce a trough that will be suitable 

 for feeding slops to hogs. 

 Instructions: 



1) Construct form as illustrated. The inner part of form 

 may be made of heavy clay if it is desired to make the 

 bottom of trough with a curved surface. 



